Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached: ii

OPTOS 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

N/A

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

N/A

An event changing the breakdown of voting rights

N/A

Other (please specify):

N/A

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

AVIVA PLC AND SUBSIDIARIES

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

REGISTERED HOLDER

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

09-AUGUST-2011

6. Date on which issuer notified:

10-AUGUST-2011

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

>5% (Change at Combined Interest Level)

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Direct

Direct

Indirect

Direct

Indirect

Ordinary SharesGB00B0WHW246

2,908,265

2,908,265

3,616,478

2,980,496

635,982

4.18%

0.89%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

N/A

N/A

N/A

N/A

N/A

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date

Exercise/Conversion period

Number of voting rights instrument refers to

% of voting rights

N/A

N/A

N/A

N/A

N/A

Nominal

Delta

N/A

N/A

Total (A+B+C)

Number of voting rights

Percentage of voting rights

3,616,478

5.07%

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

VOTING RIGHTS ARE MANAGED BY AVIVA INVESTORS GLOBAL SERVICES LIMITIED WITH THE FOLLOWING CHAIN OF CONTROLLED UNDERTAKINGS:

·; Aviva plc (Parent Company)

·; Aviva Group Holdings Limited (wholly owned subsidiary of Aviva plc)

·; Aviva Investors Holdings Limited (wholly owned subsidiary of Aviva Group Holdings Limited)

·; Aviva Investors Global Services Limited (wholly owned subsidiary of Aviva Investors Holdings Limited)

Proxy Voting:

10. Name of the proxy holder:

SEE SECTION 4

11. Number of voting rights proxy holder will ceaseto hold:

N/A

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

N/A

13. Additional information:

N/A

14. Contact name:

JOHN McNEIL, COMPANY SECRETARY

15. Contact telephone number:

+44 (0) 1383 843 337 / +44 (0) 7870 240 325