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:

Probability 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:

Credit Agricole Cheuvreux International Ltd

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

Credit Agricole Cheuvreux International Ltd

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

30/01/09

6. Date on which issuer notified:

03/01/09

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

Less than 3%

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

Less than 3%

Number of shares

Number of voting rights

Number of shares

Number of voting rights

Percentage of voting rights

Direct

Indirect

Direct

Indirect

GB00B16KQ132

1,309,211

1,309,211

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

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

SAS Rue La Boétie

Crédit Agricole SA

Calyon SA

Crédit Agricole Cheuvreux SA

Crédit Agricole Cheuvreux International Limited  Less than 3%

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:

Anne McLeod

15. Contact telephone name:

0207 214 6518