Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

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

Spirax Sarco Engineering plc

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

Yes

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

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

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

BLACK ROCK 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:

01-Dec-09

6. Date on which issuer notified:

04-Dec-09

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

11%

8. Notified details:

A: Voting rights attached to shares

Class/type of shares

if possible using the 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

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

Ordinary

Share

5,047,149

5,047,149

N/A

N/A

6,906,535

9.04%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/  Conversion  Period

Number of voting rights that may be acquired if the instrument is exercised/ converted.

% of voting rights

 N/A

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Exercise  price

Expiration  date

Exercise/ Conversion  period

Number of voting  rights instrument  refers to

% of voting rights

CFD

N/A

N/A

N/A

1,790,323

Nominal

Delta

 2.34%

Total (A+B+C)

Number of voting rights

Percentage of voting rights

8,696,858

 11.39%

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 - 8,696,858 (11.39%)

On 1 December 2009, the Barclays Global Investors (BGI) business was acquired by BlackRock, Inc. The combined holdings of BlackRock, Inc following this acquisition triggered this disclosure requirement.

Proxy Voting:

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:

Blackrock Compliance Disclosures Team

14. Contact name:

Stuart Watchorn 

15. Contact telephone number:

020 7743 5741 / [email protected]