Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

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

BTG PLC

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

X

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

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

Invesco Limited

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

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

21 June 2010

6. Date on which issuer notified:

22 June 2010

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

26%, 27%

8. Notified details:

A: Voting rights attached to shares

Class/type of shares

if possible using the 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

Indirect

Direct

Indirect

Ordinary 10p Shares GB0001001592

67,384,265

67,384,265

69,656,367

27.03%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ Conversion Period

Number 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

Exercise/ Conversion period

Number of voting rights instrument refers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

69,656,367

27.03%

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

Bank of Ireland (Dublin) - 1,175,349 Bank of New York - 58,382,482

Bank of New York London - 140,459

Boston Safe Deposit - 83,588

Chase Bank Hong Kong - 421,303

Chase Bank - 27,140

HSBC Bank London - 766,551

Mellon Bank, Pittsburg - 316,380

State Street Trust & Banking Co (Boston) - 168,350

State Street Trust & Banking Co (London) - 7,591,894

Trust & Custody Services JP - 13,896

Northern Trust Company (London) - 568,975

Proxy Voting:

10. Name of the 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:

Andy Burrows

15. Contact telephone number:

0207 575 1741