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               10 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       9,280,899      2.02%      499,780       0.11%
securities
(2) Derivatives      593,229      0.13%    2,622,813       0.57%
(other than
options)
(3) Options and            0      0.00%            0       0.00%
agreements to
purchase/sell
Total              9,874,128      2.15%    3,122,593       0.68%


(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      17,288               4.9537
Purchase      10,708               4.9503
Purchase      8,757                4.9629
Purchase      19,760               .0988
Purchase      42,280               4.9926
Purchase      4,810                4.9800
Purchase      29,700               4.9857
Purchase      33,776               4.9886
Purchase      6,490                4.9672
Sale          3,500                4.9700
Sale          3,500                4.9700
Sale          43,300               5.0282
Sale          11,489               5.0049
Sale          37,852               4.9902
Sale          43,300               5.0282
Sale          31,868               4.9920
Sale          4,858                5.0042
Sale          4,016                5.0192
Sale          27,250               4.9939

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          4553          4.9687
CFD            Long          37852         4.9901
CFD            Long          31868         4.992
CFD            Long          27250         4.9938
CFD            Long          4858          5.0041
CFD            Long          11489         5.0048
CFD            Long          4016          5.0191
CFD            Short         19760         0.0987
CFD            Short         10708         4.9502
CFD            Short         17288         4.9536
CFD            Short         8757          4.9629
CFD            Short         6490          4.9671
CFD            Short         3184          4.9731
CFD            Short         4810          4.98
CFD            Short         29700         4.9857
CFD            Short         33776         4.9885
CFD            Short         42280         4.9925

(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                         11 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