Director/PDMR Shareholding

Byotrol PLC
01 August 2007

                    Byotrol plc ('Byotrol' or 'the Company')

                            Directors' Shareholdings


The Board of Byotrol announces that it has granted the following options to
Directors of the Company:


 1. 50,000 options exercisable at 50p per share pursuant to the Byotrol
    Unapproved Share Option Scheme, to the Chairman, Wesley Devoto.
 2. 100,000 options exercisable at 50p per share pursuant to the Byotrol
    Unapproved Share Option Scheme, to the Chief Executive, David McRobbie.
 3. 100,000 options exercisable at 50p per share pursuant to the Byotrol
    Unapproved Share Option Scheme, to the Deputy Chairman, Stephen Falder.
 4. 50,000 options exercisable at 50p per share pursuant to the Byotrol
    Unapproved Share Option Scheme, to the Finance Director, Richard Bell.
 5. 50,000 options exercisable at 50p per share pursuant to the Byotrol
    Unapproved Share Option Scheme, to a Non-Executive Director, Ian Mainman.


All options were granted by the remuneration committee on 31 July 2007. All
options are exercisable at any time between 31 July 2009 and 30 July 2017
subject to the closing mid-market share price of Byotrol being not less than
180p each business day for a consecutive period of three months.



Following the grant of these options, the directors have the following
interests:


                       Number of Options Total Number of Shares % of issued share            Existing  % of issued share
                                 Granted           Under Option           capital        shareholding            capital

Wesley Devoto                     50,000                 50,000             0.11%             424,200              0.97%
David McRobbie                   100,000                325,000             0.74%           3,647,614              8.40%
Stephen Falder                   100,000                325,000             0.74%           4,787,757             11.03%
Richard Bell                      50,000                100,000             0.23%              10,000              0.02%
Ian Mainman                       50,000                 50,000             0.11%             303,000              0.69%





Enquiries:


Byotrol plc                                              0161 277 9518

Richard Bell      Finance Director                       07825 204110



Charles Stanley Securities                               020 7149 6457

Philip Davies / Anthony Noakes




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