Annual Information Update

Cairn Energy PLC
20 April 2006


FOR IMMEDIATE RELEASE


                                                                   20 April 2006


                  CAIRN ENERGY PLC ('Cairn' or the 'Company')


                           Annual Information Update

In accordance with Prospectus Rule 5.2 the following information has been published or made available to the public 
over the 12 months to 20 April 2006.

This information was published on the dates shown and may now be, or may at any time become, out of date, due to 
changing circumstances.

1. Announcements made via a Regulatory Information Service

Date       Announcement
28 April   Directors' Interests in Shares - Awards Under the Company's Long Term
2005       Incentive Plan
28 April   Section 329 Companies Act 1985 Notification - Purchase of Shares by
2005       the Trustee of the Cairn Energy PLC Employees' Share Trust
28 April   Block Listing Six Monthly Returns
2005
29 April   Notification of Shareholding - Merrill Lynch
2005
4 May 2005 2004 Annual Report and Accounts
3 June     AGM Trading Statement
2005
3 June     AGM Resolutions - Voting Results
2005
7 June     Notification of Shareholding - Merrill Lynch
2005
13 June    Confirmation of 18 Month Appraisal Extension in Block RJ-ON-90/1
2005       Rajasthan, India
24 June    Notification of Shareholding - Merrill Lynch
2005
11 July    Notification of Shareholding - Merrill Lynch
2005
18 July    Pre-Close Trading and Operational Update
2005
26 July    Cairn Awarded New Exploration Blocks in India
2005
12 August  Notification of Shareholding - Deutsche Bank
2005
15 August  Notification of Shareholding - Morley Fund Management
2005
7          Notification of Shareholding - Merrill Lynch
September
2005
8          Notification of Shareholding - Merrill Lynch
September
2005
8          2005 Interim Reporting and Adoption of International Financial
September  Reporting Standards
2005
14         Notification of Shareholding - Merrill Lynch
September
2005
20         Notification of Shareholding - Merrill Lynch
September
2005
20         2005 Interim Results Announcement
September
2005
26         Notification of Shareholding - Merrill Lynch
September
2005
28 October Block Listing Six Monthly Returns
2005
2 November Notification of Shareholding - Aviva
2005
3 November Notification of Shareholding - Merrill Lynch
2005
9 November Notification of Shareholding - Deutsche Bank
2005
10         Forthcoming Site Visit and Operational Update
November
2005
14         Notification of Shareholding - Merrill Lynch
November
2005
23         Notification of Shareholding - Aviva
November
2005
6 December Notification of Shareholding - Merrill Lynch
2005
9 December Notification of Shareholding - Merrill Lynch
2005
12         Notification of Shareholding - AEGON
December
2005
17 January Operational and Trading Update
2006
3 February Notification of Shareholding - Merrill Lynch
2006
7 February Notification of Shareholding - Merrill Lynch
2006
16         Notification of Shareholding - Merrill Lynch
February
2006
28         2005 Preliminary Results Reporting and Adoption of International
February   Financial Reporting Standards
2006
6 March    Notification of Shareholding - Fidelity International
2006
9 March    Notification of Shareholding - Deutsche Bank
2006
14 March   2005 Preliminary Results Announcement
2006
15 March   Notification of Shareholding - Fidelity
2006
17 March   Notification of Shareholding - Merrill Lynch
2006
21 March   Notification of Shareholding - Fidelity
2006
23 March   Notification of Shareholding - Deutsche Bank
2006
23 March   Notification of Shareholding - Merrill Lynch
2006
24 March   2005 Annual Report and Accounts
2006
29 March   Notification of Shareholding - Deutsche Bank
2006
29 March   Notification of Shareholding - Merrill Lynch
2006
31 March   Notification of Shareholding - Merrill Lynch
2006
31 March   Notification of Shareholding - Fidelity
2006
20 April   AGM Trading Statement
2006
20 April   AGM Resolutions - Voting Results
2006
20 April   AGM Special Business
2006
20 April   Annual Information Update
2006
20 April   Appointment of Chief Executive Officer for Cairn India IPO Company
2006

Details of all regulatory announcements for Cairn can be found on the London Stock Exchange website at 
www.londonstockexchange.com/en-gb/

2. Documents filed with Companies House

Date               Document
20 April 2005      Form 88(2) Return of Allotment of Shares
21 April 2005      Form 88(2) Return of Allotment of Shares
25 April 2005      Form 88(2) Return of Allotment of Shares
26 April 2005      Form 88(2) Return of Allotment of Shares
27 April 2005      Form 88(2) Return of Allotment of Shares
3 May 2005         Form 88(2) Return of Allotment of Shares
9 May 2005         Form 88(2) Return of Allotment of Shares
10 May 2005        Form 88(2) Return of Allotment of Shares
12 May 2005        Form 88(2) Return of Allotment of Shares
26 May 2005        Form 88(2) Return of Allotment of Shares
27 May 2005        2204 Annual Report and Accounts
31 May 2005        Form 88(2) Return of Allotment of Shares
1 June 2005        Form 88(2) Return of Allotment of Shares
2 June 2005        Form 88(2) Return of Allotment of Shares (2)
3 June 2005        Resolutions passed as Special Business at the Company's AGM
3 June 2005        New Articles of Association of the Company
3 June 2005        Form 88(2) Return of Allotment of Shares
10 June 2005       Form 88(2) Return of Allotment of Shares
13 June 2005       Form 88(2) Return of Allotment of Shares
15 June 2005       Form 88(2) Return of Allotment of Shares
17 June 2005       Form 88(2) Return of Allotment of Shares
21 June 2005       Form 88(2) Return of Allotment of Shares
28 June 2005       Form 88(2) Return of Allotment of Shares
11 July 2005       Form 88(2) Return of Allotment of Shares
21 July 2005       Form 288c Change of Particulars for Director
25 July 2005       Form 88(2) Return of Allotment of Shares
27 July 2005       Form 88(2) Return of Allotment of Shares
1 August 2005      Form 88(2) Return of Allotment of Shares
2 August 2005      Form 88(2) Return of Allotment of Shares
3 August 2005      Form 88(2) Return of Allotment of Shares
8 August 2005      Form 88(2) Return of Allotment of Shares
9 August 2005      Form 88(2) Return of Allotment of Shares (2)
16 August 2005     Form 88(2) Return of Allotment of Shares
17 August 2005     Form 88(2) Return of Allotment of Shares
18 August 2005     Form 88(2) Return of Allotment of Shares
19 August 2005     Form 88(2) Return of Allotment of Shares
20 August 2005     Form 88(2) Return of Allotment of Shares
22 August 2005     Form 88(2) Return of Allotment of Shares
28 September 2005  Form 88(2) Return of Allotment of Shares
3 October 2005     Form 88(2) Return of Allotment of Shares
5 October 2005     Form 88(2) Return of Allotment of Shares
12 October 2005    Form 88(2) Return of Allotment of Shares
13 October 2005    Form 88(2) Return of Allotment of Shares (2)
14 November 2005   Form 88(2) Return of Allotment of Shares
15 November 2005   Form 88(2) Return of Allotment of Shares
17 November 2005   Form 88(2) Return of Allotment of Shares
24 November 2005   Form 88(2) Return of Allotment of Shares
14 December 2005   Form 88(2) Return of Allotment of Shares
5 January 2006     Form 88(2) Return of Allotment of Shares
10 January 2006    Form 88(2) Return of Allotment of Shares
12 January 2006    Form 88(2) Return of Allotment of Shares
18 January 2006    Form 88(2) Return of Allotment of Shares
23 January 2006    Form 363s Annual Return
24 January 2006    Form 88(2) Return of Allotment of Shares
25 January 2006    Form 88(2) Return of Allotment of Shares
27 January 2006    Form 88(2) Return of Allotment of Shares
2 February 2006    Form 88(2) Return of Allotment of Shares
3 February 2006    Form 88(2) Return of Allotment of Shares
24 February 2006   Form 88(2) Return of Allotment of Shares
3 March 2006       Form 88(2) Return of Allotment of Shares
6 March 2006       Form 88(2) Return of Allotment of Shares
6 March 2006       Form 288c Change of Particulars for Director
10 March 2006      Form 88(2) Return of Allotment of Shares
14 March 2006      Form 88(2) Return of Allotment of Shares
15 March 2006      Form 88(2) Return of Allotment of Shares
16 March 2006      Form 88(2) Return of Allotment of Shares
20 March 2006      Form 88(2) Return of Allotment of Shares
23 March 2006      Form 88(2) Return of Allotment of Shares
27 March 2006      Form 88(2) Return of Allotment of Shares
28 March 2006      Form 88(2) Return of Allotment of Shares
29 March 2006      Form 88(2) Return of Allotment of Shares
30 March 2006      Form 88(2) Return of Allotment of Shares
3 April 2006       Form 88(2) Return of Allotment of Shares
4 April 2006       Form 88(2) Return of Allotment of Shares
5 April 2006       Form 88(2) Return of Allotment of Shares
7 April 2006       Form 88(2) Return of Allotment of Shares
10 April 2006      Form 88(2) Return of Allotment of Shares
11 April 2006      Form 88(2) Return of Allotment of Shares
13 April 2006      Form 88(2) Return of Allotment of Shares
18 April 2006      Form 88(2) Return of Allotment of Shares
19 April 2006      Form 88(2) Return of Allotment of Shares

The above documents can be found on the Companies House website at www.companieshouse.gov.uk//index.shtml

3. Documents sent to shareholders

Date                       Document
4 May 2005                 2004 Annual Report and Accounts
4 May 2005                 2004 Environmental and Social Review
27 September 2005          2005 Interim Report and Accounts
24 March 2006              2005 Annual Report and Accounts
24 March 2006              2005 Corporate Responsibility Report

The above documents can be found on Cairn's website at www.cairn-energy.plc.uk




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