Holding(s) in Company

Screen Technology Group plc
29 March 2007



TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES





1.      Identity of the issuer or the underlying issuer of existing shares to
which voting rights are attached (ii):



Screen Technology Plc



2.      Reason for the notification (please state Yes/No): (    )



An acquisition or disposal of voting rights: (No)



An acquisition or disposal of financial instruments which may result in the
acquisition of shares already issued to which voting rights are attached: (No)



An event changing the breakdown of voting rights: (No)



Other (please specify): (Yes) - Final Deadline Re:  DTR 5



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



Herald Investment Management Limited



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



N/A



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



N/A



6.      Date on which issuer notified:



20 March 2007



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



5%




8.      Notified details:



N/A



A:   Voting rights attached to shares


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


GB00B0CZZC91                      1,837,300                          1,837,300

                                  (5.22%)                            (5.22%)



Resulting situation after the triggering transaction (vii)


Class/type of shares if         Number of shares         Number of voting rights (ix)  % of voting rights
possible using the ISIN CODE
                                Direct                   Direct (x)  Indirect (xi)     Direct    Indirect


GB00B0CZZC91                                                         1,837,300                   5.22%



B:   Financial Instruments

Resulting situation after the triggering transaction (xii)


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






Total (A+B)


Number of voting rights           % of voting rights

1,837,300                         5.22%




9.      Chain of controlled undertakings through which the voting rights and/or
the financial instruments are effectively held, if applicable (xv):



Herald Investment Management Limited, a discretionary investment manager, is the
parent undertaking of an investment management business.


Herald Investment Trust (in the name of Bank of New York (OCS Nominees
Limited)
                                                                                 1,837,300         5.22%
Total for Funds under the management of Herald Investment Management
Limited
                                                                                 1,837,300         5.22%



Proxy Voting:



10.    Name of the proxy holder:



N/A



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



N/A



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



N/A



13.    Additional information:



N/A



14.    Contact name:



Andrew Miller



15.    Contact telephone number:



020 7553 6308



Annex to Notification Of Major Interests In Shares (xvi)



A:     Identity of the person or legal entity subject to the notification
obligation:



Full name (including legal form for legal entities):

Herald Investment Management Limited




Contact address (registered office for legal entities):

10/11 Charterhouse Square, London, EC1M 6EE



Phone number:

020 7553 6308



Other useful information (at least legal representative for legal persons):

Andrew Miller



B:     Identity of the notifier, if applicable (xvii)



Full name:

As above



Contact address:

.................



Phone number:

.................



Other useful information (e.g. functional relationship with the person or legal
entity subject to the notification obligation):

N/A



C:     Additional information:

N/A




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