Holding(s) in Company

Radstone Technology PLC
20 September 2006

                                       Arnhold and S. Bleichroeder Advisers, LLC
                                                     1345 Avenue of the Americas
                                                                        New York
                                                                      10105-4300
                                                             Tel: [phone]


September 19, 2006

Group Headquarters
Radstone Technology PLC
Tove Valley Business Park
Towcester
Northants
NN12 6PF
United Kingdome





Dear Sirs:



Disclosure of interests under Companies Act 1985



This notice is given under section 198 of the Companies Act 1985.



As of September 19, 2006 Arnhold and S. Bleichroeder Advisers, LLC ("ASBA") is
interested, for the purposes of the Companies Act 1985, in an aggregate of
1,005,023 shares of Radstone Technology PLC, such shares representing 3.313% of
the company's 30,339,640 total shares outstanding. ASBA's interests are
comprised of 30,151 shares held directly by accounts managed by ASBA and 974,872
shares in which ASBA, acting in the capacity of investment advisor, is or may be
regarded as interested under section 204 of the Companies Act 1985, pursuant to
certain derivative contracts entered into by certain of its clients.



Details of the registered holders of the shares in which ASBA is or may be
interested and its derivative counterparties are set forth in the tables below.



1. Direct holdings and interests of funds in which ASBA is interested


Registered holder of shares        Nature of interest                               Number of shares
Starview Capital Management LLC    Direct holding in account of starview Capital              30,151
                                   Management LLC managed by ASBA



2. Interests pursuant to derivative contracts


Registered holder of shares     Derivative counterparty               Nature of              Number of
                                                                      interest               shares
ING Bank N.V                    Aetos Corporation                     Section 204            502,511
ING Bank N.V                    Arnhold and S. Bleichroeder Holdings, Section 204            253,768
                                Inc.
ING Bank N.V                    Iolaire Investors Limited Partnership Section 204            193,467
ING Bank N.V                    MSS Arbitrage 1                       Section 204             25,126



We have not made enquiry of Aetos Corporation, Iolaire Invstors Limited
Partnership, MSS Arbitrage 1 or Starview Capital management LLC as to the number
of shares in which such organisations may be interested apart from the holdings
mentioned above, and in which ASBA may be interested pursuant to section 205 of
the Companies Act 1985.



Please sign and return the enclosed copy of this letter to me at the address
above or via fax at [phone] as confirmed of your receipt. If you have
any questions, you may contact me by telephone, at [phone], or by
electronic mail at [e-mail]



Yours truly,

Wade Rubenstein
Compliance Analyst


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