REG-Johnson Matthey PLC: Holding(s) in Company

NOTIFICATION OF MAJOR INTERESTS IN SHARES

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

Johnson Matthey plc

2. Reason for the notification:

An acquisition or disposal of voting rights

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

BlackRock, Inc.

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

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

18 January 2008

6. Date on which issuer notified:

22 January 2008

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

Gone above 5%

8. Notified details:

VOTING RIGHTS ATTACHED TO SHARES:

Class/type of shares (if possible using the ISIN CODE):

GB0004764071

Situation previous to the triggering transaction:

Number of shares: 10,669,053

Number of voting rights: 10,669,053

Resulting situation after the triggering transaction:

Number of shares (direct): N/A

Number of voting rights (direct): N/A

Number of voting rights (indirect): 10,844,281

% of voting rights (direct): N/A

% of voting rights (indirect): 5.05%

Total voting rights: 10,844,281 shares (5.05%)

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

BlackRock Investment Management (UK) Limited - 10,844,281 (5.05%)

10. Name of the 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:

15. Angela Purtill, Assistant Company Secretary, Johnson Matthey plc

Contact Telephone Number:

020 7269 8461

22 January 2008

END