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               15 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       9,353,841      2.04%      466,763       0.10%
securities
(2) Derivatives      551,090      0.12%    2,737,774       0.60%
(other than
options)
(3) Options and            0      0.00%            0       0.00%
agreements to
purchase/sell
Total              9,904,931      2.16%    3,204,537       0.70%


(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      39,211               4.7804
Purchase      5,000                4.8424
Purchase      20,807               4.7572
Purchase      19,202               4.7371
Purchase      38,500               4.7163
Purchase      2,876                4.7800
Purchase      1,750                4.7800
Purchase      22,096               4.7795
Purchase      10,976               4.7800
Purchase      2,167                4.9750
Sale          3,593                4.7800
Sale          2,167                4.9750
Sale          4,179                4.7792
Sale          20,673               4.7463
Sale          9,600                4.7359
Sale          21,749               4.7589
Sale          11,197               4.7735


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          9600          4.7358
CFD            Long          20673         4.7462
CFD            Long          21749         4.7589
CFD            Long          11197         4.7735
CFD            Long          4179          4.7792
CFD            Short         38500         4.7162
CFD            Short         2168          4.7313
CFD            Short         19202         4.7371
CFD            Short         6911          4.7566
CFD            Short         20807         4.7572
CFD            Short         39211         4.7803
CFD            Short         5000          4.8424


(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                         16 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