Rule 8.1 - London Stock Exchange Plc (LSE)

ABN AMRO BANK N.V.
                  

                               FORM 8.1
      DEALINGS BY OFFERORS, OFFEREE COMPANIES OR THEIR ASSOCIATES
              FOR THEMSELVES OR FOR DISCRETIONARY CLIENTS
  (Rules 8.1(a) and (b)(i) of the City Code on Takeovers and Mergers)

1. KEY INFORMATION

Name of person dealing (Note 1)           ABN AMRO BANK NV LONDON BRANCH
---------------------------------------------------------------------------------------------------------
Company dealt in                          London Stock Exchange Plc (LSE)
---------------------------------------------------------------------------------------------------------
Class of relevant security to which the   Ord GBP 0.058333
 dealings being disclosed relate (Note 2)
---------------------------------------------------------------------------------------------------------
Date of dealing                           24th March 2006
---------------------------------------------------------------------------------------------------------

The disposal of the ordinary shares in London Stock Exchange Plc (a constituent
of the FTSE 250 Index) referred to below on the 24th March 2006, was undertaken
by ABN AMRO Bank N.V. London Branch as part of a hedge transaction to reduce the
economic exposure of the basket swap.

The Panel Executive has informed ABN AMRO Bank NV on an ex parte basis that such
transactions are permitted and have no Code consequences.

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 securities                   1,960 (0.0008%)
--------------------------------------------------------------------------------------------------------
(2) Derivatives (other than options)
--------------------------------------------------------------------------------------------------------
(3) Options and agreements to
 purchase/sell
--------------------------------------------------------------------------------------------------------
Total                                     1,960 (0.0008%)
--------------------------------------------------------------------------------------------------------

(b) Interests and short positions in relevant securities of the company, other
than the class dealt in (Note 3)
       Class of relevant security:                     Long                          Short
--------------------------------------------------------------------------------------------------------
                                          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 (Note 5)
---------------------------------------------------------------------------------------------------------
Sale                               600,000                           11.3200 GBP
---------------------------------------------------------------------------------------------------------

(b) Derivatives transactions (other than options)

Product name,       Long/short (Note 6)    Number of securities (Note 7)   Price per unit (Note 5)
e.g. CFD
--------------------------------------------------------------------------------------------------------

(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 option    selling,        securities to     price      American,   date      paid/received
                    purchasing,     which the option             European               per unit (Note
                    varying etc.    relates (Note 7)             etc.                   5)
-------------------------------------------------------------------------------------------------------

(ii) Exercising

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

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

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

4. OTHER INFORMATION

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) YES/NO

Date of disclosure                                          27th  March 2006
---------------------------------------------------------------------------------------------------------
Contact name                                                Kirit Devshi
---------------------------------------------------------------------------------------------------------
Telephone number                                            020 7678 1904
---------------------------------------------------------------------------------------------------------
Name of offeree/offeror with which associated               Euronext NV
---------------------------------------------------------------------------------------------------------
Specify category and nature of associate status (Note 10)   Adviser
---------------------------------------------------------------------------------------------------------

Notes

The Notes on Form 8.1 can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk