Holding(s) in Company

Radstone Technology PLC
21 September 2006

                                       Credit Suisse Securities (Europe) Limited
                                                                One Cabot Square
                                                                          London
                                                                         E14 4QJ
                                                        Tel: [phone]
                                                        Fax: [phone]



Fax: [phone]



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


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