Rule 8.3 - London Stock Exchange plc

Halcyon Asset Management LLC
                  

                                    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

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Name of person dealing (Note 1)            Halcyon Asset Management LLC and Halcyon Offshore Asset
                                            Management LLC on behalf of discretionary clients
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Company dealt in                           London Stock Exchange plc
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Class of relevant security to which the    Ordinary Shares
 dealings being disclosed relate (Note 2)
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Date of dealing                            November 20, 2006
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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)

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                                                        Long                             Short
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                                           Number                      (%) Number                        (%)
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(1) Relevant securities
------------------------------------------ ------------------------------- ---------------------------------
(2) Derivatives (other than options)       2,494,821             1.16775 %
------------------------------------------ ------------------------------- ---------------------------------
(3) Options and agreements to
 purchase/sell
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Total                                      2,494,821             1.16775 %
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(b) Interests and short positions in relevant securities of the company, other
than the class dealt in (Note 3)

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Class of relevant security:                             Long                             Short
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                                           Number                      (%) Number                        (%)
------------------------------------------ ------------------------------- ---------------------------------
(1) Relevant securities
------------------------------------------ ------------------------------- ---------------------------------
(2) Derivatives (other than options)
------------------------------------------ ------------------------------- ---------------------------------
(3) Options and agreements to
 purchase/sell                             100,000                 0.0431% 200,000                   0.0863%
------------------------------------------ ------------------------------- ---------------------------------
Total                                      100,000                 0.0431% 200,000                   0.0863%
------------------------------------------ ------------------------------- ---------------------------------
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(c) Rights to subscribe (Note 3)

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Class of relevant security:                Details
------------------------------------------ ---------------------------------------------------------------

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3. DEALINGS (Note 4)

(a) Purchases and sales

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

----------------------------------- ---------------------------------- ------------------------------------
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(b) Derivatives transactions (other than options)

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Product name,        Long/short (Note 6)     Number of securities (Note 7)    Price per unit (Note 5)
e.g. CFD
-------------------- ----------------------- -------------------------------- -----------------------------
CFD                  Short                    1,246,210 shares                12.89682 GBP
CFD                  Short                   249,242 shares                   12.9141 GBP
-------------------- ----------------------- -------------------------------- -----------------------------
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(c) Options transactions in respect of existing securities

(i) Writing, selling, purchasing or varying

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

------------------- ---------------- ------------------- ---------- ------------- ---------- -----------------
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(ii) Exercising

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

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

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

----------------------------------- --------------------------------- ----------------------------------------
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4. OTHER INFORMATION

Agreements, arrangements or understandings relating to options or derivatives

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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.
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Is a Supplemental Form 8 attached? (Note 9)                       YES

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Date of disclosure                                           November 20, 2006
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Contact name                                                 James W. Sykes
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Telephone number                                             212/303-9406
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If a connected EFM, name of offeree/offeror with which
 connected
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If a connected EFM, state nature of connection (Note 10)
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Notes

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



                               SUPPLEMENTAL FORM 8

                            DETAILS OF OPEN POSITIONS

   (This form should be attached to Form 8.1, Form 8.1(b)(ii) or Form 8.3, as
                                  appropriate)

OPEN POSITIONS (Note 1)

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Product name,        Written or   Number of securities   Exercise price  Type, e.g.      Expiry date
e.g. call option      purchased    to which the option    (Note 2)        American,
                                   or derivative relates                  European etc.
-------------------- ------------ ---------------------- --------------- --------------- ---------------------
Call Option          Purchased    100,000                1254 GBp        European        15 December 2006
-------------------- ------------ ---------------------- --------------- --------------- ---------------------
Call Option          Written      200,000                1304 GBp        European        15 December 2006
-------------------- ------------ ---------------------- --------------- --------------- ---------------------
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Notes

1. Where there are open option positions or open derivative positions (except
for CFDs), full details should be given. Full details of any existing agreements
to purchase or to sell should also be given on this form.

2. For all prices and other monetary amounts, the currency must be stated.

For details of the Code's dealing disclosure requirements, see Rule 8 and its
Notes which can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk