Holding(s) in Company

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:

Premier Oil plc

2. Reason for notification (yes/no)

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):

3. Full name of person(s) subject to notification obligation:

Aviva plc & its subsidiaries

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

Registered Holder:

BNY Norwich Union Nominees

Limited 659,983*

Chase GA Group Nominees

Limited 2,114,266*

Chase Nominees Limited

53,910*

CUIM Nominee Limited

431,133*

*denotes direct interest

BNP Paribas - London

44,592

Chase Nominees Limited

257,611

State Street Nominees Limited

535,549

Vidacos Nominees Limited

87,945

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

30 July 2008

6. Date on which issuer notified:

1 August 2008

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

4% to 5% Change at Combined Interest level

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

Number of shares

Number of voting rights

Number of shares

Number of voting rights

Percentage of voting rights

Direct

Indirect

Direct

Indirect

GB0033560011

4,037,051

4,037,051

3,259,292

3,259,292

925,697

3.97%

1.13%

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

N/A

Total (A+B)

Number of voting rights

Percentage of voting rights

4,184,989

5.10%

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

See Section 4

Proxy Voting:

10. Name of proxy holder:

See Section 4

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:

Figures are based on a total number of voting rights of 82,158,733

14 Contact name:

Jane Powney

15. Contact telephone number:

020 7730 1111