UCB Disclosure Form for Purchase of Celltech Shares LONDON, June 9 /PRNewswire-FirstCall/ -- UCB S.A. made the following disclosure today: This announcement was publicly made in the United Kingdom and makes notice of purchases of ordinary shares, nominal value 50 pence per share, in Celltech Group plc for the account or benefit of UCB S.A. otherwise than pursuant to the ongoing tender offer. FORM 8.1/8.3 Lodge with a RIS or Newstrack, if appropriate, and the Takeover Panel. Use separate form for each class of securities in which dealings have been made. Date of disclosure ...... 09/06/2004 ...... DISCLOSURE UNDER RULES 8.1(a), 8.1(b)(i) AND 8.3 OF THE CITY CODE ON TAKEOVERS AND MERGERS Date of dealing ........... 08/06/2004 ................................ Dealing in ................ Celltech Group Plc ...... (name of company) (1) Class of securities (eg ordinary shares) ........... Ordinary Shares (2) Amount bought Amount sold Price per unit 12,961,565 n/a 548 (3) Resultant total of the same class owned or controlled (and percentage of class) ............ 43,310,488 ...... (15.56%) (4) Party making disclosure ... Lazard & Co., Limited ... (Panmure Gordon) (5) EITHER (a) Name of purchaser/vendor (Note 1) ............ UCB SA OR (b) If dealing for discretionary client(s), name of fund management organization ......... N/A (6) Reason for disclosure (Note 2) (a) associate of (i) offeror (Note 3) YES (ii) offeree company NO Specify which category or categories of associate (1-8 overleaf) ................................... Financial Advisors If category (8), explain ............................................. ....................................................................... (b) Rule 8.3 (ie disclosure because of ownership or control of 1% or more of the class of relevant securities dealt in) YES Signed, for and on behalf of the party named in (4) above (Also print name of signatory) ......................... THOMAS FORCIER Telephone and extension number ......................... 0207 187 2252 Note 1. Specify owner, not nominee or vehicle company. If relevant, also identify controller of owner, eg where an owner normally acts on instructions of a controller. Note 2. Disclosure might be made for more than one reason; if so, state all reasons. Note 3. Specify which offeror if there is more than one. Note 4. When an arrangement exists with any offeror, with the offeree company or with an associate of any offeror or of the offeree company in relation to relevant securities, details of such arrangement must be disclosed, as required by Note 6 on Rule 8. Note 5. It may be necessary, particularly when disclosing derivative transactions, to append a sheet to this disclosure form so that all relevant information can be given. Note 6. In the case of an average price bargain, each underlying trade should be disclosed. Note 7. The resultant total percentage holding of the class of relevant security is to be calculated by reference to the percentage held and in issue outside treasury. For full details of disclosure requirements, see Rule 8 of the Code. If in doubt, contact the Panel on Takeovers and Mergers, Monitoring Section, Tel. No: 020 7638 0129. E-mail: DEFINITION OF ASSOCIATE It is not practicable to define associate in terms which would cover all the different relationships which may exist in an offer. The term associate is intended to cover all persons (whether or not acting in concert) who directly or indirectly own or deal in the shares of an offeror or the offeree company in an offer and who have (in addition to their normal interests as shareholders) an interest or potential interest, whether commercial, financial or personal, in the outcome of the offer. Without prejudice to the generality of the foregoing, the term associate will normally include the following: (1) an offeror's or the offeree company's parent, subsidiaries and fellow subsidiaries, and their associated companies, and companies of which such companies are associated companies (for this purpose ownership or control of 20% or more of the equity share capital of a company is regarded as the test of associated company status); (2) banks and financial and other professional advisers (including stockbrokers)* to an offeror, the offeree company or any company covered in (1), including persons controlling#, controlled by or under the same control as such banks, financial and other professional advisers; (3) the directors (together with their close relatives and related trusts) of an offeror, the offeree company or any company covered in (1); (4) the pension funds of an offeror, the offeree company or any company covered in (1); (5) any investment company, unit trust or other person whose investments an associate manages on a discretionary basis, in respect of the relevant investment accounts; (6) a person who owns or controls 5% or more of any class of relevant securities (as defined in paragraphs (a) to (d) in Note 2 on Rule 8) issued by an offeror or an offeree company, including a person who as a result of any transaction owns or controls 5% or more. When two or more persons act pursuant to an agreement or understanding (formal or informal) to acquire or control such securities, they will be deemed to be a single person for the purpose of this paragraph. Such securities managed on a discretionary basis by an investment management group will, unless otherwise agreed by the Panel, also be deemed to be those of a single person (see Note 8 on Rule 8); and (7) a company having a material trading arrangement with an offeror or the offeree company. Paragraphs (1)-(7) are typical cases. Paragraph (8) below is a category to cover associate status not within (1)-(7). (8) Other. Notes * References to a "bank" do not apply to a bank whose sole relationship with a party to an offer is the provision of normal commercial banking services or such activities in connection with the offer as confirming that cash is available, handling acceptances and other registration work. References to "financial and other professional advisers (including stockbrokers)", in relation to a party to an offer, do not include an organisation which has stood down, because of a conflict of interest or otherwise, from acting for that party in connection with the offer if the organisation is to have a continuing involvement with that party during the offer, the Panel must be consulted. Unless the Panel is satisfied that the involvement is entirely unconnected with the offer, the above exclusion will not normally apply. # The normal test for whether a person is controlled by, controls or is under the same control as another person will be by reference to the definition of control contained in the Code. There may be other circumstances which the Panel will regard as giving rise to such a relationship (eg where a majority of the equity share capital is owned by another person who does not have a majority of the voting rights); in cases of doubt, the Panel should be consulted. UCB S.A. ("UCB") filed a Tender Offer Statement on Schedule TO and other related documentation and Celltech Group plc ("Celltech") filed a Solicitation/Recommendation Statement on Schedule 14D-9 with the Securities and Exchange Commission (the "SEC") on 19 May 2004. Free copies of these documents are available on the SEC's web site at http://www.sec.gov. Shareholders are urged to read the Tender Offer Statement, the Solicitation/Recommendation Statement and the related documentation as they will contain important information. Subject to compliance with all applicable regulations (including the City Code) and in accordance with normal UK market practice, UCB or its nominees, or its brokers (acting as agents) may from time to time make certain purchases of, or arrangements to purchase, ordinary shares or American Depositary Receipts of Celltech outside the United States, other than pursuant to the Offer, before or during the period in which the Offer remains open for acceptance. These purchases may occur either in the open market at prevailing market prices or in private transactions at negotiated prices. Any information about such purchases will be disclosed as is required in the United Kingdom and communicated in the United States by way of an announcement by or on behalf of UCB. CONTACT: Brunswick Group, +44-207-404-5959, for UCB S.A. DATASOURCE: UCB S.A. CONTACT: Brunswick Group, +44-207-404-5959, for UCB S.A.

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