Holding(s) in Company

Synairgen plc
20 March 2007


TR-1:              NOTIFICATION OF MAJOR INTERESTS IN SHARES

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

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

An acquisition or disposal of voting rights

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): DTR transitional notification of holdings                               X

3. Full name of person(s) subject to the notification           Lansdowne Partners Limited being the
obligation:                                                     General Partner of Lansdowne Partners
                                                                Limited Partnership

                                                                Lansdowne UK Equity Fund Limited

                                                                Lansdowne Partners International
                                                                Limited

4. Full name of shareholder(s) (if different from 3.):          Morstan Nominees Ltd (Registered
                                                                Shareholder)

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

6. Date on which issuer notified:                               N/A

7. Threshold(s) that is/are crossed or reached:                 8%

8. Notified details:


A: Voting rights attached to shares

Class/type of    Situation previous to Resulting situation after the triggering transaction
shares           the Triggering
                 transaction
 if possible     Number of  Number of  Number of    Number of voting rights   % of voting rights
using the ISIN   Shares     Voting     shares
CODE                        Rights     Direct       Direct       Indirect     Direct       Indirect

Ordinary Shares  1,950,000  1,950,000  0            0            1,950,000    0.00%        8.99%






B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial    Expiration date Exercise/ Conversion      Number of voting rights    % of voting
instrument                           Period/ Date              that may be acquired if    rights
                                                               the instrument is
                                                               exercised/ converted

N/A                  N/A             N/A                       N/A                        N/A


Total (A+B)

Number of voting rights                            % of voting rights

1,950,000                                          8.99%


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

Lansdowne Partners International Limited is the parent undertaking of Lansdowne Partners Limited.


Proxy Voting:

10. Name of the proxy holder:                                   Lansdowne Partners Limited

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:               Lansdowne Partners Limited being the General Partner of
                                          Lansdowne Partners Limited Partnership ('LPLP') controls
                                          1,950,000 voting rights representing 8.99% of the total
                                          voting rights.

                                          Lansdowne UK Equity Fund Limited owns 1,854,751 voting
                                          rights representing 8.55% of the total voting rights.

                                          The balancing 0.44% of voting rights is held on behalf of
                                          other client funds managed by LPLP.




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