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               21 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       9,127,089      1.99%      581,166       0.13%
securities
(2) Derivatives      607,398      0.13%    2,630,494       0.57%
(other than
options)
(3) Options and            0      0.00%            0       0.00%
agreements to
purchase/sell
Total              9,734,487      2.12%    3,211,660       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      7,305                4.7253
Purchase      1,882                4.6900
Purchase      4,300                4.6657
Purchase      176,730              4.6770
Purchase      3,510                4.7742
Purchase      27,055               4.6650
Purchase      68,011               4.7455
Purchase      981                  4.6958
Sale          176,730              4.6770
Sale          36,149               4.8152
Sale          57,867               4.7533
Sale          10,710               4.6767
Sale          22,072               4.7332
Sale          50,000               5.0889
Sale          3,780                4.7466
Sale          20,000               4.7443
Sale          20,701               4.8004

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          10710         4.6767
CFD            Long          176730        4.6769
CFD            Long          30096         4.7272
CFD            Long          22072         4.7331
CFD            Long          20000         4.7442
CFD            Long          3780          4.7466
CFD            Long          57867         4.7532
CFD            Long          20701         4.8003
CFD            Long          36149         4.8151
CFD            Long          50000         5.0889
CFD            Short         4300          4.6657
CFD            Short         176730        4.6769
CFD            Short         1882          4.69
CFD            Short         981           4.6957
CFD            Short         5295          4.7107
CFD            Short         7305          4.7252
CFD            Short         68011         4.7454
CFD            Short         3510          4.7741

(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                         22 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