Holding(s) in Company

Reliance Security Group PLC
23 August 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:

Reliance Security Group 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:

Pritchards Trustees Limited as Trustee of the Reliance Security Group plc
Employees Trust

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

Pritchards Trustees Limited

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

23 August 2007

6. Date on which issuer notified:

23 August 2007

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

3%


8. Notified details:

Not Applicable


A: Voting rights attached to shares

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

Ordinary 5p                               542,599         542,599

Resulting situation after the triggering transaction

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

                                Direct     Direct     Indirect   Direct Indirect

Ordinary 5p                      738,421    195,822    542,599    0.9%     2.5%


B: Financial Instruments

Resulting situation after the triggering transaction

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





Total (A+B)
Number of voting rights                      % of voting rights

738,421                                      3.4%


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:

Not Applicable


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

Not Applicable


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

Not Applicable


13. Additional information:

195,822 shares held in certified form;

542,599 shares held in name of Greenwood Nominees Limited


14. Contact name:

Jeremy Simon


15. Contact telephone number:

01895 205 003



                      This information is provided by RNS
            The company news service from the London Stock Exchange