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TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES

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

The Weir Group PLC

2. Reason for the notification (please state 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: (No)

An event changing the breakdown of voting rights: (No)

Other (please specify): Initial notification due to change of threshold for non-material interest (No)

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

Prudential plc group of companies

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

See additional information under 13.

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

15 September 2008

6. Date on which issuer notified:

16 September 2008

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

3%

8. Notified details:

A: Voting rights attached to shares

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

B: Financial Instruments

Resulting situation after the triggering transaction

Total (A+B)

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

Prudential plc (parent Company)

The Prudential Assurance Company Limited (wholly owned subsidiary of Prudential plc

Proxy Voting:

10. Name of the proxy holder:

N/A

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

N/A

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

N/A

13. Additional information:

PRUDENTIAL PLC

M&G GROUP LIMITED

14. Contact name:

Dipesh Varsani

M&G Investment Management Limited

15. Contact telephone number:

020 7548 3261