Rule 8.3 - INMARSAT

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        BARCLAYS PLC
(Note 1)
Company dealt in              INMARSAT
Class of relevant security    ORD EUR0.0005
to which the dealings being
disclosed relate (Note 2)
Date of dealing               07 July 2008

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       9,291,118      2.03%      494,888       0.11%
securities
(2) Derivatives      610,399      0.13%    2,495,741       0.54%
(other than
options)
(3) Options and            0      0.00%            0       0.00%
agreements to
purchase/sell
Total              9,901,517      2.16%    2,990,629       0.65%


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

Class of                    Long                     Short
relevant
security:

                  Number              (%)   Number              (%)

(1) Relevant
securities

(2) Derivatives
(other than
options)

(3) Options and
agreements to
purchase/sell

Total


  (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
                                   (GBP)
Purchase      32,482               5.2327
Purchase      16,975               5.2898
Purchase      1,447                5.2795
Purchase      65,000               5.2636
Purchase      27,901               5.2581
Purchase      110,900              5.2398
Purchase      40,851               5.2153
Purchase      47,260               5.3321
Purchase      10,893               5.1486
Purchase      17,656               5.1636
Purchase      72,450               5.2627
Purchase      104,198              5.2967
Purchase      6,543                5.2787
Purchase      52,925               5.2862
Purchase      94,530               5.3321
Purchase      15,190               5.2823
Purchase      24,882               5.2528
Sale          32,276               5.1870
Sale          5,081                5.3124
Sale          15,800               5.2518
Sale          2,700                5.2650
Sale          45,094               5.2389
Sale          1,447                5.0292
Sale          3,819                5.2679
Sale          78,465               5.2298

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1447          5.0291
CFD            Long          32276         5.1869
CFD            Long          78465         5.2297
CFD            Long          45094         5.2389
CFD            Long          5327          5.2511
CFD            Long          15800         5.2517
CFD            Long          2700          5.265
CFD            Long          3819          5.2679
CFD            Long          5081          5.3124
CFD            Short         17656         5.1636
CFD            Short         3601          5.1862
CFD            Short         6510          5.201
CFD            Short         40851         5.2153
CFD            Short         32482         5.2327
CFD            Short         110900        5.2398
CFD            Short         24882         5.2528
CFD            Short         27901         5.258
CFD            Short         72450         5.2626
CFD            Short         6543          5.2787
CFD            Short         1447          5.2795
CFD            Short         15190         5.2823
CFD            Short         104198        5.2966

(c)  Options transactions in respect of existing securities

(i)  Writing, selling, purchasing or varying

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


(ii) Exercising

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




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


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




4.   OTHER INFORMATION
None

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                         08 July 2008
Contact name                               Geoff Smith
Telephone number                           020 7116 2913
If a connected EFM, name of
offeree/offeror with which connected
If a connected EFM, state nature of
connection (Note 10)


Notes

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