Rule 8.3 - Radstone Technology plc

Wellington Management FORM 8.3 DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE (Rule 8.3 of the City Code on Takeovers and Mergers) 1. KEY INFORMATION Name of person dealing (Note 1) Wellington Management Company, LLP --------------------------------------------------------------------------------------------------------- Company dealt in Radstone Technology plc --------------------------------------------------------------------------------------------------------- Class of relevant security to which the Ordinary Shares dealings being disclosed relate (Note 2) --------------------------------------------------------------------------------------------------------- Date of dealing 31 August 2006 --------------------------------------------------------------------------------------------------------- 2. INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE (a) Interests and short positions (following dealing) in the class of relevant security dealt in (Note 3) Long Short -------------------------------------------------------------------------------------------------------- Number Number (%) (%) -------------------------------------------------------------------------------------------------------- (1) Relevant securities 463,619 shares (1.53%) -------------------------------------------------------------------------------------------------------- (2) Derivatives (other than options) -------------------------------------------------------------------------------------------------------- (3) Options and agreements to purchase/sell -------------------------------------------------------------------------------------------------------- Total 463,619 shares (1.53%) -------------------------------------------------------------------------------------------------------- (b) Interests and short positions in relevant securities of the company, other than the class dealt in (Note 3) Class of relevant security: Long Short -------------------------------------------------------------------------------------------------------- Number Number (%) (%) -------------------------------------------------------------------------------------------------------- (1) Relevant securities -------------------------------------------------------------------------------------------------------- (2) Derivatives (other than options) -------------------------------------------------------------------------------------------------------- (3) Options and agreements to purchase/sell -------------------------------------------------------------------------------------------------------- Total -------------------------------------------------------------------------------------------------------- (c) Rights to subscribe (Note 3) Class of relevant security: Details --------------------------------------------------------------------------------------------------------- 3. DEALINGS (Note 4) (a) Purchases and sales Purchase/sale Number of securities Price per unit (Note 5) --------------------------------------------------------------------------------------------------------- Sale 400,000 shares 3.7350 - GBP --------------------------------------------------------------------------------------------------------- (b) Derivatives transactions (other than options) Product name, Long/short (Note 6) Number of securities (Note 7) Price per unit (Note 5) e.g. CFD -------------------------------------------------------------------------------------------------------- (c) Options transactions in respect of existing securities (i) Writing, selling, purchasing or varying Product name, Writing, Number of Exercise Type, e.g. Expiry Option money e.g. call option selling, securities to price American, date paid/received purchasing, which the option European per unit (Note varying etc. relates (Note 7) etc. 5) ------------------------------------------------------------------------------------------------------- (ii) Exercising Product name, e.g. call option Number of securities Exercise price per unit (Note 5) --------------------------------------------------------------------------------------------------------- (d) Other dealings (including new securities) (Note 4) Nature of transaction (Note 8) Details Price per unit (if applicable) (Note 5) --------------------------------------------------------------------------------------------------------- 4. OTHER INFORMATION Agreements, arrangements or understandings relating to options or derivatives Full details of any agreement, arrangement or understanding between the person disclosing and any other person relating to the voting rights of any relevant securities under any option referred to on this form or relating to the voting rights or future acquisition or disposal of any relevant securities to which any derivative referred to on this form is referenced. If none, this should be stated. --------------------------------------------------------------------------------------------------------- None --------------------------------------------------------------------------------------------------------- Is a Supplemental Form 8 attached? (Note 9) NO Date of disclosure 01 September 2006 --------------------------------------------------------------------------------------------------------- Contact name Julie A. Jenkins --------------------------------------------------------------------------------------------------------- Telephone number (617) 790-7745 --------------------------------------------------------------------------------------------------------- If a connected EFM, name of offeree/offeror with which connected N/A --------------------------------------------------------------------------------------------------------- If a connected EFM, state nature of connection (Note 10) N/A --------------------------------------------------------------------------------------------------------- Notes The Notes on Form 8.3 can be viewed on the Takeover Panel's website at www.thetakeoverpanel.org.uk

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