Exhibit 15.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-11828) of our report dated July 22, 2005, relating to the consolidated financial statements which appear in this Form 20-F. /s/ BDO Stoy Hayward LLP - ------------------------ BDO Stoy Hayward LLP London, England August 2, 2005