Rule 8.3- O2 plc

Aviva PLC
07 November 2005


                                                                        FORM 8.3

    DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE
              (Rule 8.3 of the City Code on Takeovers and Mergers)


1.         KEY INFORMATION

Name of person dealing  (Note 1)              AVIVA PLC AND ITS SUBSIDIARIES

Company dealt in                              O2 PLC

Class of relevant security to which the       ORD GBP0.001
dealings being disclosed relate (Note 2)

Date of dealing                               04 NOVEMBER 2005



2.         INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a)        Interests and short positions (following dealing) in the class of
relevant security dealt in (Note 3)

                                                            Long                              Short

                                                      Number      (%)                     Number     (%)
                                                                                       

(1) Relevant securities                          179,744,165    2.050%                         0      0%
                                                                                        
(2) Derivatives (other than options)                                0%                                0%

(3) Options and agreements to purchase/sell                         0%                                0%

Total                                            179,744,165    2.050%                         0      0%
                                                                                          



(b)        Interests and short positions in relevant securities of the company,
other than the class dealt in (Note 3)


Class of relevant security:                                  Long                              Short
                                                      Number     (%)                      Number     (%)
                                                                                       

(1) Relevant securities                                         0%                                  0%

(2) Derivatives (other than options)                            0%                                  0%

(3) Options and agreements to purchase/sell                     0%                                  0%

Total                                                           0%                                  0%


(c)        Rights to subscribe (Note 3)


Class of relevant security:                   Details



3.         DEALINGS (Note 4)

(a)        Purchases and sales

Purchase/sale                           Number of securities                Price per unit (Note 5)

SALE                                    3,780                               GBP1.970000
PURCHASE                                2,240                               GBP1.970000



(b)        Derivatives transactions (other than options)

Product name,         Long/short (Note 6)       Number of securities (Note 7)       Price per unit (Note 5)
e.g. CFD



(c)        Options transactions in respect of existing securities

(i)         Writing, selling, purchasing or varying

Product name,        Writing, selling, Number of securities Exercise   Type, e.g.     Expiry     Option money
                       purchasing,     to which the option             American,
e.g. call option     varying etc.      relates (Note 7)     price      European etc.  date       paid/received
                                                                                                 per unit (Note
                                                                                                 5)



(ii)        Exercising

Product name, e.g. call option         Number of securities                 Exercise price per unit (Note 5)




(d)        Other dealings (including new securities) (Note 4)

Nature of transaction (Note 8)         Details                              Price per unit (if applicable) (Note 5)





4.         OTHER INFORMATION

Agreements, arrangements or understandings relating to options or derivatives


Full details of any agreement, arrangement or understanding between the person disclosing and any other person relating
to the voting rights of any relevant securities under any option referred to on this form or 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.



Is a Supplemental Form 8 attached? (Note 9)            NO



Date of disclosure                                                07 NOVEMBER 2005

Contact name                                                      NEIL WHITTAKER

Telephone number                                                  01603 684420

If a connected EFM, name of offeree/offeror with which connected  N/A

If a connected EFM, state nature of connection (Note 10)          N/A




Notes

The Notes on Form 8.3 can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk



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