For filings with the FSA include the
 annex

 For filings with issuer exclude the
 annex


+------------------------------------------------------------------------------+
|TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES(i)                             |
+------------------------------------------------------------------------------+

+---------------------------------------------+--------------------------------+
|1. Identity of the issuer or the underlying  |                                |
|issuer                                       |            G4S plc             |
|of existing shares to which voting rights are|                                |
|attached:(ii)                                |                                |
+---------------------------------------------+--------------------------------+
|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|   X   |
|to qualifying financial instruments                                   |       |
+----------------------------------------------------------------------+-------+
|An event changing the breakdown of voting rights                      |       |
+----------------------------------------------------------------------+-------+
|Other (please specify):                                               |       |
+--------------------------------------+-------------------------------+-------+
|3. Full name of person(s) subject to  |                                       |
|the                                   |            BlackRock, Inc             |
|notification obligation:(iii)         |                                       |
+--------------------------------------+---------------------------------------+
|4. Full name of shareholder(s)        |                                       |
|(if different from 3.):(iv)           |                                       |
+--------------------------------------+---------------------------------------+
|5. Date of the transaction and date on|                                       |
|which the threshold is crossed or     |          3(RD) FEBRUARY 2012          |
|reached:(v)                           |                                       |
+--------------------------------------+---------------------------------------+
|6. Date on which issuer notified:     |          7(TH) FEBRUARY 2012          |
+--------------------------------------+---------------------------------------+
|7. Threshold(s) that is/are crossed or|       HOLDING HAS GONE ABOVE 5%       |
|reached:(vi, vii)                     |                                       |
+--------------------------------------+---------------------------------------+

+-----------------------------------------------------------------------------------------+
|8. Notified details:                                                                     |
+-----------------------------------------------------------------------------------------+
|A: Voting rights attached to shares(viii, ix)                                            |
+------------+----------------------+-----------------------------------------------------+
|Class/type  |Situation previous    |Resulting situation after the triggering transaction |
|of          |to the triggering     |                                                     |
|shares      |transaction           |                                                     |
|            +----------+-----------+------------+------------------------+---------------+
|if possible |Number    |Number     |Number      |Number of voting        |% of  voting   |
|using       |of        |of         |of shares   |rights                  |rights(x)      |
|the ISIN    |  ares    |V ting     +------------+----------+-------------+------+--------+
|CODE        |          |Rights     |Direct      |Direct(xi)|Indirect(xii)|Direct|Indirect|
+------------+----------+-----------+------------+----------+-------------+------+--------+
|GB00B01FLG62|          |           |            |          |             |      |        |
|            |68,166,785|68,166,785 |N/A         |N/A       |70,751,402   |N/A   |5.02%   |
|            |          |           |            |          |             |      |        |
+------------+----------+-----------+------------+----------+-------------+------+--------+

+-----------------------------------------------------------------------------------------+
|B: Qualifying Financial Instruments                                                      |
+-----------------------------------------------------------------------------------------+
|Resulting situation after the triggering transaction                                     |
+--------------+----------+-----------------------+-------------------------+-------------+
|Type of       |Expiration|Exercise/              |Number of voting         |% of voting  |
|financial     |date(xiii)|Conversion Period(xiv) |rights that may be       |rights       |
|instrument    |          |                       |acquired if the          |             |
|              |          |                       |instrument is            |             |
|              |          |                       |exercised/ converted.    |             |
+--------------+----------+-----------------------+-------------------------+-------------+
|              |          |                       |                         |             |
+--------------+----------+-----------------------+-------------------------+-------------+

+-----------------------------------------------------------------------------------------+
|C: Financial Instruments with similar economic effect to Qualifying Financial            |
|Instruments(xv, xvi)                                                                     |
+-----------------------------------------------------------------------------------------+
|Resulting situation after the triggering transaction                                     |
+-------------+---------+----------+-------------+-------------------------+--------------+
|Type of      |Exercise |Expiration|Exercise/    |Number of voting rights  |% of voting   |
|financial    |price    |date(xvii)|Conversion   |instrument refers to     |rights(xix,   |
|instrument   |         |          |period(xviii)|                         |xx)           |
|             |         |          |             |                         |              |
+-------------+---------+----------+-------------+-------------------------+-------+------+
|             |         |          |             |878,532                  |Nominal|Delta |
|CFD          |         |          |             |                         +-------+------+
|             |         |          |             |                         |0.06%  |0.06% |
+-------------+---------+----------+-------------+-------------------------+-------+------+

+-----------------------------------------------------------------------------------------+
|Total (A+B+C)                                                                            |
+------------------------------------+----------------------------------------------------+
|Number of voting rights             |Percentage of voting rights                         |
+------------------------------------+----------------------------------------------------+
|70,751,402                          |5.02%                                               |
+------------------------------------+----------------------------------------------------+

+--------------------------------------------------------------------------+
|9. Chain of controlled undertakings through which the voting rights and/or|
|the                                                                       |
|financial instruments are effectively held, if applicable:(xxi)           |
+--------------------------------------------------------------------------+
|                                                                          |
|    BlackRock Investment Management (UK) Limited - 70,751,402 (5.02%)     |
+--------------------------------------------------------------------------+

+--------------------------------------------------------------------------+
|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:            |Peter David, Company Secretary              |
+-----------------------------+--------------------------------------------+
|15. Contact telephone number:|+ 44(0)1293 554584                          |
+-----------------------------+--------------------------------------------+







This announcement is distributed by Thomson Reuters on behalf of 
Thomson Reuters clients. The owner of this announcement warrants that: 
(i) the releases contained herein are protected by copyright and 
    other applicable laws; and 
(ii) they are solely responsible for the content, accuracy and 
     originality of the information contained therein. 
    
Source: G4S plc UK via Thomson Reuters ONE

[HUG#1583692]