Holding(s) in Company

Radstone Technology PLC 21 September 2006 Credit Suisse Securities (Europe) Limited One Cabot Square London E14 4QJ Tel: +44 (0)20 7888 8888 Fax: +44 (0)20 7888 1600 Fax: 01327 322 817 The Company Secretary Radstone Technology plc Tove Valley Business Park Towcester Northants, NN12 6PF 20 September 2006 Dear Sirs, Radstone Technology plc ("The Company") This notification relates to the ordinary shares of the Company ("the shares") and is given in fulfilment of the obligations imposed under section 198 of the Companies Act 1985 ("the Act"). We hereby notify you that on 18 September 2006, following acquisitions, Credit Suisse Securities (Europe) Limited ("CSSEL") held an interest in 1,919,060 shares, being equivalent to approximately 6.33% of the issued share capital of the Company. Those Credit Suisse companies which are direct or indirect holding companies of CSSEL are, under the terms of section 203 of the Act, each interested by attribution in any shares in which CSSEL is interested. Yours faithfully, Rob Daborn Vice President - Legal and Compliance This information is provided by RNS The company news service from the London Stock Exchange

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