Holding(s) in Company

Radstone Technology PLC 24 January 2006 The Company has received the following notification: Wellington Management Company, LLP 75 State Street Boston Massachusetts 02109 Telephone: (617) 951 5000 23 January 2006 N Novakovic Company Secretary Radstone Technology plc Tove Valley Business Park Towcester Northamptonshire NN12 6JN Notification concerning interests in shares of Radstone Technology plc (the " Company") Dear N. Novakovic: 1 Wellington Management Company, LLP ("Wellington Management") is registered as an investment adviser with the United States Securities and Exchange Commission under section 203 of the Investment Advisors Act of 1940, as amended and acts as discretionary investment manager on behalf of various separate accounts (the " Accounts") that hold an interest in shares of the Company, Wellington Management's interest in the shares is as an investment manager, as is mentioned in Section 205(5) of the Companies Act 1985 (the "Act"). The Accounts do not act as a group nor do they act in concert with respect to the interests in shares. Wellington Management acquired the interests in shares for the Accounts in its capacity as discretionary investment manager to, and solely for the benefit of, the Accounts, and the interests were acquired solely for investment purposes. The shares are registered in the name of the Accounts or the Accounts' custodians or nominees according to their respective holdings. 2 Wellington Management as discretionary investment manager on behalf of the Accounts currently holds, in the aggregate, an interest, within the meaning of Sections 203 and 208 of the Act, in 2,308,737 ordinary shares, or 7.62% of the shares outstanding of the Company. This represents a decrease of 1.20% since our last notification on 07 March 2005. Therefore, Wellington Management hereby gives notice to the Company of such interest in shares, pursuant to the provisions of Sections 198(1) and 208(4)(B) of the Act. 3 This notice is given in fulfilment of, and for the express purpose of discharging the obligations imposed on us by, Sections 198(1) and 208(4)(B) of the Act and arising out of the circumstances referred to in paragraph 2. If you have any questions or comments, please do not hesitate to contact me at 9617) 790-7745. Regards, Julie A. Jenkins Vice President and Counsel Wellington Management Company, LLP This information is provided by RNS The company news service from the London Stock Exchange

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