Diploma Regulatory News (DPLM)

For filings with the FSA include the annex

For filings with issuer exclude the annex

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:

DIPLOMA 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:

Lincoln Vale European Partners Master Fund L.P.

Philip A. Cooper

Managing Partner

By, Lincoln Vale General Partner L.P.

Acting by its General Partners, Lincoln Vale European Partners GP LLC

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

Lincoln Vale European Partners Master Fund, L.P.

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

April 6, 2010

6. Date on which issuer notified:

April 7, 2010

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

3.0%

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

GB0001826634

3,438,460

3,438,460

LESS THAN 3%

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

LESS THAN 3%

LESS THAN 3%

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

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:

14 Contact name:

Joseph A Zadlo

Associate, Lincoln Vale LLC

15. Contact telephone number:

+1 781 257 0600