TR1 Notification of Major Interest in Shares

For filings with the FSA include the annex

For filings with issuer exclude the annex

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:

IDOX 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: iii

Constellation Software Inc.

4. Full name of shareholder(s)

(if different from 3): iv

Pershing Nominees Limited (A/C PSL981)

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

05 March 2010

6. Date on which issuer notified:

11 March 2010

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

Increase from 4.85% through the 5% threshold

8: Notified Details

A: Voting rights attached to shares viii, ix

Class/type of shares

If possible use 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 xi

Indirect xii

Direct

Indirect

Ord 1p

ISIN number

GB0002998192

16,950,000

17,200,000

5.02%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date xiii

Exercise/ conversion period/date xiv

No. of voting rights that may be acquired if the instrument is exercised/converted

% of voting rights

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 xvii

Exercise/ conversion period xviii

No. of voting rights instrument refers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

17,200,000

5.02%

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

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:

John Billowits

15. Contact telephone name:

+1 (416) 861-0630