Holding(s) in Company

RNS Number:6424D
Plectrum Petroleum PLC
11 September 2007

TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES

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

Plectrum Petroleum plc

2. Reason for the notification (please place an X inside the appropriate
bracket/s):

An acquisition or disposal of voting rights: (X)

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 the notification obligation:

Capricorn Oil & Gas Limited (a subsidiary of Cairn Energy PLC)

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

N/A

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

07/09/2007

6. Date on which issuer notified:

07/09/2007

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

29%

8. Notified details:

A: Voting rights attached to shares

Class/type of shares if possible Situation previous to the Triggering transaction
using the ISIN CODE

Number of shares Number of voting Rights

Ordinary shares of 5p - -

Resulting situation after the triggering transaction

Class/type of shares if Number of shares Number of voting rights % of voting rights
possible using the ISIN CODE

Direct Direct Indirect Direct Indirect

53,540,000 53,540,000 - 29.683% -

B: Financial Instruments

Resulting situation after the triggering transaction

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

Total (A+B)

Number of voting rights % of voting rights

53,540,000 29.683%

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

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will cease to hold:

N/A

12. Date on which proxy holder will cease to hold voting rights:

N/A

13. Additional information: