Notice of Closing Date of Offer

10 August 2011

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION (DIRECTLY OR INDIRECTLY) IN WHOLE OR IN PART IN, INTO OR FROM ANY JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OR REGULATIONS OF SUCH JURISDICTION

FOR IMMEDIATE RELEASE

New Recommended Cash Offer by Orca Holdings Limited for OpSec Security Group plc

Notice of Closing Date of Offer

Introduction

On 2 June 2011, Orca Holdings Limited ("Orca") and the Independent Directors of OpSec Security Group plc ("OpSec") announced the terms of a new recommended cash offer (the "New Offer") for the entire issued (and to be issued) share capital of OpSec not already owned by Orca. The terms of and conditions to the New Offer were set out in the New Offer Document and Form of Acceptance, which were posted to OpSec Shareholders on 8 June 2011.

On 15 July 2011, Orca announced that the New Offer was declared unconditional in all respects and was extended until further notice.

Closing Date

The New Offer, which remains subject to the terms set out in the New Offer Document, will remain open for acceptance until 1.00 p.m. (London time) on 31 August 2011 (the "Closing Date"), when it will close. The New Offer will not be extended beyond the Closing Date.

To accept the New Offer

OpSec Shareholders who wish to accept (and have not yet validly accepted) the New Offer are encouraged to do so without delay and no later than 1.00pm (London Time) on 31 August 2011.

To accept the New Offer for OpSec Shares held in certificated form (that is, not held in CREST), OpSec Shareholders should complete, sign and return the Form of Acceptance, which accompanies the New Offer Document, as soon as possible (together with their share certificate(s) and/or other documents of title) and, in any event, so as to be received by post or by hand (during normal business hours only) to Capita Registrars , Corporate Actions, The Registry, 34 Beckenham Road, Beckenham, Kent BR3 4TU by 1.00 p.m. (London time) on 31 August 2011.

To accept the New Offer for OpSec Shares held in uncertificated form (that is, held in CREST), OpSec Shareholders should ensure that an Electronic Acceptance is made by them or on their behalf and that the TTE Instruction settles as soon as possible and, in any event, by no later than 1.00 p.m. (London time) on 31 August 2011. OpSec Shareholders who hold their OpSec Shares as a CREST sponsored member should refer to their CREST sponsor as only their CREST sponsor will be able to send the necessary TTE Instruction to Euroclear.

Capitalised terms used but not defined in this announcement shall have the meaning given to them in the New Offer Document.

Enquiries:

Orca Holdings Limited

Deborah Botwood Smith Tel: +44 (0) 20 7629 6600

Numis Securities Limited

Etienne Bottari / Oliver Cardigan / Alex Ham Tel: +44 (0) 20 7260 1000