Rule 8.3 - O2 PLC

FORM 8.3

   DEALINGS BY PERSONS WHO OWN OR CONTROL 1% OR MORE OF ANY CLASS OF RELEVANT
                                    SECURITY
              (Rule 8.3 of The City Code on Takeovers and Mergers)

Name of purchaser/vendor *                  BARCLAYS PLC
Company dealt in                            O2 PLC
Relevant security dealt in                  ORD GBP 0.001
If a connected EFM, name of offeree/offeror
with which connected
If a connected EFM, nature of connection #
Date of dealing                             31 OCTOBER 2005

DEALINGS †

Amount bought                               Price per unit (currency must be stated)
796,559                                     2.0550
4,966,545                                   2.0462
17,509,338                                  2.0588
30,110,842                                  2.0549
2,000,000                                   204.14
81,189                                      203.71
308,196                                     2.0522
377,193                                     2.0405

Amount sold                                 Price per unit (currency must be stated)
385,350                                     2.0566

Resultant total amount and percentage of the
same relevant security owned or controlled  252,591,072 (2.88%)


IS A SUPPLEMENTAL FORM 8 (DERIVATIVE)/FORM 8 (OPTION) ATTACHED?        YES

Date of disclosure                          01 NOVEMBER 2005
Contact name                                BARCLAYS CORPORATE SECRETARIAT
Telephone number                            0207 116 2913

*Specify the owner or controller in addition to the person dealing.  The naming
 of nominees or vehicle companies is insufficient.  In the case of disclosure
 of dealings by fund managers on behalf of discretionary clients, the clients
 need not be named.
#See the definition of "connected fund managers and principal traders" in the
 Definitions Section of the Code.
†If disclosing dealings/holdings in derivatives or options, please attach
 Supplemental Form 8 (Derivative) or Supplemental Form 8 (Option), as
 appropriate.

For details of the Code's dealing disclosure requirements, see Rule 8 and its
Notes which can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk.


SUPPLEMENTAL FORM 8 (DERIVATIVE)

                        DEALINGS/HOLDINGS IN DERIVATIVES
  (This form should be attached to Form 8.1, Form 8.1(b)(ii), Form 8.2 or Form
                              8.3, as appropriate)


Description of all derivative products disclosed on  CFD - A purchaser of a CFD will realise a gain if
this form                                            the price of the underlying security goes up. A
                                                     seller of a CFD will realise a gain if the price of
                                                     the underlying security goes down. The CFD
                                                     contracts are open ended and there is no rollover
                                                     into new contracts.


Full details of any agreement, arrangement or        None
understanding between the person disclosing and any
other person relating to the voting rights or
future acquisition or disposal of any relevant
securities to which any derivative referred to on
this form is referenced.  If none, this should be
stated.


WRITING/ENTERING INTO A DERIVATIVE

Product name    Transaction     Writing/entering    Number of securities to    Reference     Maturity
eg long CFD     date            into (indicate as   which the derivative is    price         date
                                applicable)         referenced                 (currency
                                                                               must be
                                                                               stated)
Short CFD       31/10/2005      Written             2,000,000                  2.0414
Short CFD       31/10/2005      Written             81,189                     2.0371
Short CFD       31/10/2005      Written             308,196                    2.0522
Short CFD       31/10/2005      Written             377,193                    2.0405


CLOSING OUT A DERIVATIVE

Product name    Transaction     Number of securities to which the   Reference price   Closing out price
eg long CFD     date            derivative is referenced            (currency must    (currency must be
                                                                    be stated)        stated)





DETAILS OF OPEN DERIVATIVES (excluding any transaction set out above)

Product name   Transaction    Written/        Number of      Reference price   Maturity date
eg long CFD    date           entered into    securities     (currency
                              (indicate as    to which the   must be stated)
                              applicable)     derivative
                                              is referenced
Long CFD       14/03/2005     Written         1,100,851      1.2672
Long CFD       14/03/2005     Written         20,000         1.2700
Long CFD       14/03/2005     Written         168,616        0.0000
Long CFD       14/03/2005     Written         1,050,000      0.0000
Long CFD       15/03/2005     Written         155,477        1.2684
Long CFD       15/03/2005     Written         1,141,488      1.2657
Long CFD       16/03/2005     Written         386,060        1.2411
Long CFD       17/03/2005     Written         53,719         1.2491
Long CFD       17/03/2005     Written         338,627        1.2397
Long CFD       18/03/2005     Written         249,053        1.2366
Long CFD       18/03/2005     Written         47,918         1.2350
Long CFD       21/03/2005     Written         20,000         1.2375
Long CFD       22/03/2005     Written         10,000         1.1975
Long CFD       22/03/2005     Written         226,800        1.1961
Long CFD       29/03/2005     Written         589,557        1.1599
Long CFD       29/03/2005     Written         169,000        1.1594
Long CFD       30/03/2005     Written         1,333,642      1.1667
Long CFD       31/03/2005     Written         743,697        1.1901
Long CFD       01/04/2005     Written         2,474,307      1.2165
Long CFD       01/04/2005     Written         88,000         1.2202
Long CFD       04/04/2005     Written         40,000         1.2031
Long CFD       05/04/2005     Written         2,319,967      1.2119
Long CFD       05/04/2005     Written         10,000         1.2200
Long CFD       06/04/2005     Written         572,180        1.2251
Long CFD       06/04/2005     Written         796,411        1.2107
Long CFD       08/04/2005     Written         20,000         1.2275
Long CFD       11/04/2005     Written         40,000         1.2319
Long CFD       11/04/2005     Written         302            1.2244
Long CFD       12/04/2005     Written         279,872        1.2175
Long CFD       12/04/2005     Written         30,000         1.2125
Long CFD       13/04/2005     Written         2,990          1.2199
Long CFD       13/04/2005     Written         72,051         1.2259
Long CFD       14/04/2005     Written         10,000         1.2250
Long CFD       15/04/2005     Written         10,000         1.1900
Long CFD       19/04/2005     Written         236,560        1.1547
Long CFD       19/04/2005     Written         87,169         1.1575
Long CFD       21/04/2005     Written         158,998        1.1474
Long CFD       25/04/2005     Written         64,338         1.1474
Long CFD       26/04/2005     Written         10,000         1.1650
Long CFD       27/04/2005     Written         10,000         1.1500
Long CFD       28/04/2005     Written         20,000         1.1838
Long CFD       29/04/2005     Written         276,849        1.1706
Long CFD       29/04/2005     Written         110,056        1.1719
Long CFD       03/05/2005     Written         35,290         1.1710
Long CFD       03/05/2005     Written         84,904         1.1678
Long CFD       05/05/2005     Written         20,000         1.1600
Long CFD       06/05/2005     Written         95,643         1.1628
Long CFD       10/05/2005     Written         20,000         1.1763
Long CFD       11/05/2005     Written         10,000         1.1600
Long CFD       12/05/2005     Written         60,000         1.1625
Long CFD       13/05/2005     Written         50,000         1.1560
Long CFD       16/05/2005     Written         55,000         1.1511
Long CFD       17/05/2005     Written         2,614,000      1.1600
Long CFD       19/05/2005     Written         79,557         1.2088
Long CFD       19/05/2005     Written         280,000        1.1942
Long CFD       19/05/2005     Written         500,000        1.2032
Long CFD       20/05/2005     Written         250,000        1.2488
Long CFD       23/05/2005     Written         20,583         1.2500
Long CFD       24/05/2005     Written         268,490        1.2474
Long CFD       24/05/2005     Written         19,792         1.2462
Long CFD       25/05/2005     Written         18,508         1.2475
Long CFD       25/05/2005     Written         250,000        1.2488
Long CFD       26/05/2005     Written         39,117         1.2525
Long CFD       26/05/2005     Written         10,000         1.2525
Long CFD       26/05/2005     Written         500,000        1.2681
Long CFD       31/05/2005     Written         292,590        1.2772
Long CFD       01/06/2005     Written         10,000         1.2575
Long CFD       03/06/2005     Written         103,616        1.2344
Long CFD       08/06/2005     Written         99,428         1.2444
Long CFD       09/06/2005     Written         195,741        1.2433
Long CFD       10/06/2005     Written         26,681         1.2638
Long CFD       10/06/2005     Written         42,000         1.2725
Long CFD       10/06/2005     Written         250,000        1.2687
Long CFD       13/06/2005     Written         19,554         1.2627
Long CFD       13/06/2005     Written         147,498        1.2561
Long CFD       14/06/2005     Written         47,000         1.2714
Long CFD       14/06/2005     Written         3,646          1.2699
Long CFD       15/06/2005     Written         404,114        1.2700
Long CFD       16/06/2005     Written         539,434        1.2775
Long CFD       16/06/2005     Written         23,185         1.2834
Long CFD       20/06/2005     Written         280,539        1.2831
Long CFD       20/06/2005     Written         238,475        1.2808
Long CFD       21/06/2005     Written         260,457        1.2814
Long CFD       21/06/2005     Written         10,000         1.2825
Long CFD       22/06/2005     Written         231,588        1.2777
Long CFD       22/06/2005     Written         1,225,187      1.2758
Long CFD       23/06/2005     Written         91,356         1.2799
Long CFD       23/06/2005     Written         446,333        1.2698
Long CFD       24/06/2005     Written         20,000         1.2863
Long CFD       27/06/2005     Written         20,000         1.2675
Long CFD       27/06/2005     Written         45,338         1.2619
Long CFD       28/06/2005     Written         67,940         1.2816
Long CFD       28/06/2005     Written         100,000        1.2905
Long CFD       30/06/2005     Written         541,702        1.3594
Long CFD       30/06/2005     Written         866,779        1.3642
Long CFD       01/07/2005     Written         531,003        1.3451
Long CFD       04/07/2005     Written         63,600         1.3433
Long CFD       05/07/2005     Written         58,333         1.3245
Long CFD       05/07/2005     Written         113,797        1.3236
Long CFD       06/07/2005     Written         168,898        1.3350
Long CFD       06/07/2005     Written         1,031,473      1.3355
Long CFD       06/07/2005     Written         137,744        1.3324
Long CFD       07/07/2005     Written         487,194        1.3345
Long CFD       08/07/2005     Written         93,200         1.3604
Long CFD       11/07/2005     Written         396,174        1.3568
Long CFD       13/07/2005     Written         88,500         1.3878
Long CFD       13/07/2005     Written         49,097         1.3836
Long CFD       14/07/2005     Written         103,417        1.3874
Long CFD       14/07/2005     Written         36,100         1.3861
Long CFD       15/07/2005     Written         55,953         1.3775
Long CFD       15/07/2005     Written         7,037          1.3775
Long CFD       18/07/2005     Written         63,074         1.3650
Long CFD       19/07/2005     Written         39,855         1.3786
Long CFD       21/07/2005     Written         180,547        1.3987
Long CFD       21/07/2005     Written         10,000         1.4025
Long CFD       22/07/2005     Written         30,000         1.4186
Long CFD       25/07/2005     Written         187,999        1.4211
Long CFD       27/07/2005     Written         1,113,737      1.3872
Long CFD       29/07/2005     Written         370,333        1.4018
Long CFD       01/08/2005     Written         12,172         1.3919
Long CFD       02/08/2005     Written         20,000         1.4100
Long CFD       02/08/2005     Written         16,012         1.4089
Long CFD       03/08/2005     Written         1,053,029      1.3961
Long CFD       04/08/2005     Written         473,387        1.3975
Long CFD       04/08/2005     Written         42,425         1.3948
Long CFD       05/08/2005     Written         35,707         1.3849
Long CFD       10/08/2005     Written         1,742,044      1.4379
Long CFD       10/08/2005     Written         109,604        1.4416
Long CFD       11/08/2005     Written         37,997         1.4461
Long CFD       12/08/2005     Written         20,000         1.4788
Long CFD       12/08/2005     Written         46,514         1.4760
Long CFD       15/08/2005     Written         1,999,325      1.4668
Long CFD       16/08/2005     Written         50,000         1.4190
Long CFD       16/08/2005     Written         100,000        1.4319
Long CFD       17/08/2005     Written         200,000        1.4456
Long CFD       17/08/2005     Written         37,375         1.4560
Long CFD       18/08/2005     Written         29,848         1.4883
Long CFD       18/08/2005     Written         370,537        1.4819
Long CFD       18/08/2005     Written         27,311         1.4885
Long CFD       18/08/2005     Written         350,000        1.4953
Long CFD       19/08/2005     Written         1,746,246      1.5285
Long CFD       19/08/2005     Written         13,731         1.5076
Long CFD       19/08/2005     Written         625,012        1.5333
Long CFD       19/08/2005     Written         150,000        1.5160
Long CFD       22/08/2005     Written         1,000,000      1.5299
Long CFD       23/08/2005     Written         1,000,000      1.5368
Long CFD       24/08/2005     Written         129,200        1.5252
Long CFD       26/08/2005     Written         39,200         1.5237
Long CFD       30/08/2005     Written         108,500        1.4975
Long CFD       30/08/2005     Written         785,762        1.4988
Long CFD       31/08/2005     Written         173,966        1.5276
Long CFD       31/08/2005     Written         20,000         1.5275
Long CFD       01/09/2005     Written         431,490        1.5490
Long CFD       01/09/2005     Written         349,456        1.5508
Long CFD       02/09/2005     Written         534,386        1.5489
Long CFD       05/09/2005     Written         15,700         1.5548
Long CFD       05/09/2005     Written         37,611         1.5587
Long CFD       06/09/2005     Written         282,000        1.5547
Long CFD       07/09/2005     Written         798,478        1.5380
Long CFD       09/09/2005     Written         64,944         1.5375
Long CFD       16/09/2005     Written         85,000         1.5573
Long CFD       19/09/2005     Written         27,300         1.5377
Long CFD       23/09/2005     Written         68,558         1.5489
Long CFD       26/09/2005     Written         24,300         1.5277
Long CFD       26/09/2005     Written         117,487        1.5316
Long CFD       30/09/2005     Written         15,376         1.5639
Long CFD       03/10/2005     Written         30,500         1.6340
Long CFD       05/10/2005     Written         167,475        1.6526
Long CFD       06/10/2005     Written         397,949        1.6464
Long CFD       07/10/2005     Written         275,600        1.6222
Long CFD       07/10/2005     Written         24,548         1.6398
Long CFD       11/10/2005     Written         20,000         1.6388
Long CFD       11/10/2005     Written         77,948         1.6392
Long CFD       12/10/2005     Written         30,000         1.6267
Long CFD       17/10/2005     Written         22,100         1.5950
Long CFD       18/10/2005     Written         16,551         1.5833
Long CFD       19/10/2005     Written         99,921         1.5650
Long CFD       19/10/2005     Written         126,582        1.5524
Long CFD       19/10/2005     Written         12,022         1.5650
Long CFD       21/10/2005     Written         378,340        1.5497
Long CFD       24/10/2005     Written         99,000         1.5772
Long CFD       25/10/2005     Written         176,000        1.6128
Long CFD       26/10/2005     Written         200,774        1.6233
Long CFD       26/10/2005     Written         20,000         1.6298
Long CFD       26/10/2005     Written         42,346         1.6167
Long CFD       27/10/2005     Written         42,736         1.6123
Long CFD       28/10/2005     Written         82,900         1.6320
Long CFD       28/10/2005     Written         395,092        1.6423
Short CFD      14/03/2005     Written         35,000         1.2583
Short CFD      14/03/2005     Written         2,574,000      0.0000
Short CFD      14/03/2005     Written         728,331        0.0000
Short CFD      15/03/2005     Written         42,061         1.2655
Short CFD      16/03/2005     Written         512,757        1.2491
Short CFD      16/03/2005     Written         255,270        1.2413
Short CFD      16/03/2005     Written         1,314,372      0.0000
Short CFD      16/03/2005     Written         1,550,464      0.0000
Short CFD      18/03/2005     Written         126,159        1.2409
Short CFD      21/03/2005     Written         500,000        1.2394
Short CFD      22/03/2005     Written         186,800        1.2001
Short CFD      22/03/2005     Written         10,000         1.1850
Short CFD      23/03/2005     Written         1,669,347      1.1563
Short CFD      23/03/2005     Written         446,545        1.1552
Short CFD      23/03/2005     Written         976,315        1.1513
Short CFD      24/03/2005     Written         679,389        1.1633
Short CFD      24/03/2005     Written         10,000         1.1625
Short CFD      29/03/2005     Written         360,855        1.1623
Short CFD      29/03/2005     Written         500,000        1.1592
Short CFD      30/03/2005     Written         781,929        1.1646
Short CFD      01/04/2005     Written         169,000        1.1925
Short CFD      04/04/2005     Written         727,479        1.2029
Short CFD      05/04/2005     Written         1,749,023      1.2173
Short CFD      07/04/2005     Written         308,400        1.2100
Short CFD      07/04/2005     Written         10,000         1.2100
Short CFD      11/04/2005     Written         168,918        1.2281
Short CFD      13/04/2005     Written         436,072        1.2216
Short CFD      14/04/2005     Written         61,905         1.2250
Short CFD      18/04/2005     Written         406,397        1.1632
Short CFD      18/04/2005     Written         40,000         1.1606
Short CFD      20/04/2005     Written         318,500        1.1521
Short CFD      20/04/2005     Written         370,831        1.1497
Short CFD      21/04/2005     Written         320,849        1.1458
Short CFD      21/04/2005     Written         1,086,121      1.1478
Short CFD      25/04/2005     Written         351,648        1.1462
Short CFD      25/04/2005     Written         362,979        1.1492
Short CFD      26/04/2005     Written         89,119         1.1666
Short CFD      27/04/2005     Written         39,400         1.1762
Short CFD      28/04/2005     Written         26,900         1.1669
Short CFD      04/05/2005     Written         386,391        1.1587
Short CFD      04/05/2005     Written         10,000         1.1575
Short CFD      06/05/2005     Written         50,000         1.1640
Short CFD      09/05/2005     Written         8,800          1.1600
Short CFD      09/05/2005     Written         40,000         1.1550
Short CFD      10/05/2005     Written         40,000         1.1681
Short CFD      13/05/2005     Written         10,000         1.1500
Short CFD      16/05/2005     Written         29,258         1.1476
Short CFD      17/05/2005     Written         10,000         1.1500
Short CFD      18/05/2005     Written         490,523        1.1591
Short CFD      19/05/2005     Written         130,500        1.2016
Short CFD      19/05/2005     Written         80,000         1.2069
Short CFD      20/05/2005     Written         520,549        1.2424
Short CFD      20/05/2005     Written         10,732         1.2475
Short CFD      20/05/2005     Written         352,219        1.2475
Short CFD      24/05/2005     Written         10,000         1.2550
Short CFD      27/05/2005     Written         20,000         1.2725
Short CFD      01/06/2005     Written         1,485,448      1.2580
Short CFD      03/06/2005     Written         51,749         1.2383
Short CFD      06/06/2005     Written         1,491,647      1.2255
Short CFD      06/06/2005     Written         60,000         1.2235
Short CFD      07/06/2005     Written         309,285        1.2527
Short CFD      08/06/2005     Written         20,000         1.2400
Short CFD      09/06/2005     Written         10,000         1.2450
Short CFD      16/06/2005     Written         26,100         1.2700
Short CFD      17/06/2005     Written         20,000         1.2850
Short CFD      21/06/2005     Written         74,755         1.2824
Short CFD      22/06/2005     Written         175,000        1.2773
Short CFD      23/06/2005     Written         289,755        1.2674
Short CFD      27/06/2005     Written         9,200          1.2800
Short CFD      30/06/2005     Written         9,900          1.3825
Short CFD      01/07/2005     Written         8,035          1.3426
Short CFD      04/07/2005     Written         35,737         1.3447
Short CFD      04/07/2005     Written         1,077,000      1.3425
Short CFD      05/07/2005     Written         141,251        1.3284
Short CFD      07/07/2005     Written         124,688        1.3072
Short CFD      07/07/2005     Written         77,435         1.3025
Short CFD      08/07/2005     Written         10,000         1.3525
Short CFD      11/07/2005     Written         9,070          1.3601
Short CFD      15/07/2005     Written         85,369         1.3575
Short CFD      19/07/2005     Written         29,847         1.3600
Short CFD      20/07/2005     Written         14,265         1.3915
Short CFD      20/07/2005     Written         5,857          1.3825
Short CFD      21/07/2005     Written         10,000         1.3875
Short CFD      22/07/2005     Written         192,647        1.4271
Short CFD      26/07/2005     Written         1,595,333      1.4295
Short CFD      26/07/2005     Written         1,476,711      1.4324
Short CFD      27/07/2005     Written         500,000        1.3825
Short CFD      27/07/2005     Written         30,000         1.3914
Short CFD      27/07/2005     Written         49,097         1.3889
Short CFD      28/07/2005     Written         100,000        1.3881
Short CFD      28/07/2005     Written         806,069        1.3922
Short CFD      28/07/2005     Written         36,100         1.3839
Short CFD      28/07/2005     Written         1,577,000      1.3935
Short CFD      29/07/2005     Written         50,000         1.4056
Short CFD      01/08/2005     Written         877,490        1.3868
Short CFD      02/08/2005     Written         413,508        1.3846
Short CFD      03/08/2005     Written         245,628        1.4125
Short CFD      05/08/2005     Written         277,968        1.3828
Short CFD      08/08/2005     Written         570,328        1.3882
Short CFD      09/08/2005     Written         242,498        1.4244
Short CFD      11/08/2005     Written         20,000         1.4488
Short CFD      11/08/2005     Written         150,000        1.4644
Short CFD      16/08/2005     Written         46,514         1.4289
Short CFD      17/08/2005     Written         1,022,521      1.4606
Short CFD      17/08/2005     Written         437,472        1.4577
Short CFD      17/08/2005     Written         654,860        1.4615
Short CFD      24/08/2005     Written         10,000         1.5250
Short CFD      30/08/2005     Written         45,400         1.5042
Short CFD      07/09/2005     Written         439,837        1.5374
Short CFD      09/09/2005     Written         11,200         1.5400
Short CFD      09/09/2005     Written         233            1.5327
Short CFD      13/09/2005     Written         10,000         1.5258
Short CFD      14/09/2005     Written         6,340          1.5052
Short CFD      15/09/2005     Written         294,400        1.5222
Short CFD      15/09/2005     Written         7,059          1.5152
Short CFD      15/09/2005     Written         37,375         1.5209
Short CFD      16/09/2005     Written         83,500         1.5365
Short CFD      19/09/2005     Written         123,900        1.5607
Short CFD      19/09/2005     Written         30,000         1.5410
Short CFD      20/09/2005     Written         15,176         1.5523
Short CFD      20/09/2005     Written         30,000         1.5600
Short CFD      21/09/2005     Written         187,701        1.5393
Short CFD      26/09/2005     Written         177,709        1.5891
Short CFD      27/09/2005     Written         1,231,213      1.5610
Short CFD      27/09/2005     Written         20,000         1.5663
Short CFD      28/09/2005     Written         504,166        1.5852
Short CFD      28/09/2005     Written         67,799         1.5724
Short CFD      29/09/2005     Written         929,230        1.5889
Short CFD      30/09/2005     Written         477,799        1.5708
Short CFD      03/10/2005     Written         212,732        1.5819
Short CFD      04/10/2005     Written         20,400         1.6185
Short CFD      04/10/2005     Written         23,106         1.6223
Short CFD      05/10/2005     Written         171,286        1.6583
Short CFD      06/10/2005     Written         279,143        1.6518
Short CFD      07/10/2005     Written         24,548         1.6277
Short CFD      07/10/2005     Written         30,500         1.6185
Short CFD      10/10/2005     Written         10,000         1.6000
Short CFD      11/10/2005     Written         10,000         1.6250
Short CFD      11/10/2005     Written         229,865        1.6321
Short CFD      12/10/2005     Written         30,000         1.6310
Short CFD      13/10/2005     Written         383,770        1.5726
Short CFD      13/10/2005     Written         59,081         1.5902
Short CFD      14/10/2005     Written         10,000         1.5802
Short CFD      17/10/2005     Written         11,542         1.5827
Short CFD      18/10/2005     Written         50,000         1.5809
Short CFD      19/10/2005     Written         126,582        1.5677
Short CFD      19/10/2005     Written         30,000         1.5383
Short CFD      19/10/2005     Written         66,290         1.5408
Short CFD      19/10/2005     Written         296,535        1.5330
Short CFD      19/10/2005     Written         95,000         1.5328
Short CFD      20/10/2005     Written         60,000         1.5388
Short CFD      20/10/2005     Written         664,822        1.5408
Short CFD      20/10/2005     Written         29,349         1.5334
Short CFD      21/10/2005     Written         865,168        1.5473
Short CFD      26/10/2005     Written         310,883        1.6167
Short CFD      27/10/2005     Written         42,736         1.6202
Short CFD      28/10/2005     Written         335,909        1.5852