DMTR.L Regulatory News (DMTR)

TR-1: Notifications of Major Interests in Shares

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

Oxford Advanced Surfaces Group plc

2. Reason for notification (yes/no)

An acquisition or disposal of voting rights

Yes

An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An event changing the breakdown of voting rights

Other (please specify):______________

3. Full name of person(s) subject to notification obligation:

IP Group plc

4. Full name of shareholder(s) (if different from 3):

Registered Holders:

IP2IPO Limited 28,503,396

IP2IPO Nominees Limited nil

5. Date of transaction (and date on which the threshold is crossed or reached if different):

9 February 2010

6. Date on which issuer notified:

10 February 2010

7. Threshold(s) that is/are crossed or reached:

14% reached

8: Notified Details

A: Voting rights attached to shares

Class/type of shares

If possible use ISIN code

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of shares

Number of voting rights

Number of shares

Number of voting rights

Percentage of voting rights

Direct

Indirect

Direct

Indirect

1p Ord

34,318,532

34,318,532

28,503,396

28,503,396

0

14.6%

0

B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ conversion period/date

No. of voting rights that may be acquired (if the instrument exercised/converted)

Percentage of voting rights

Total (A+B)

Number of voting rights

Percentage of voting rights

28,503,396

14.6%

9. Chain of controlled undertakings through which the voting rights and /or the financial instruments are effectively held, if applicable:

IP2IPO Limited and IP2IPO Nominees Limited are 100% subsidiaries of IP Group plc

Proxy Voting:

10. Name of proxy holder:

11. Number of voting rights proxy holder will cease to hold:

12. Date on which proxy holder will cease to hold voting rights:

13. Additional information:

Legal title to the 5,815,136 shares previously held by IP2IPO Nominees Limited on behalf of current and former members of IP Group plc staff under a nominee agreement has now been transferred to the beneficial holders of those shares.

IP Group's beneficial interest in 28,503,396 shares of the company is unchanged by the transfer of legal title.

Voting rights have been calculated based on shares in issue of 195,740,641.

14 Contact name:

Greg Smith

15. Contact telephone name:

020 7444 0050