Holding(s) in Company

17 Apr 2012 07:00

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi 1. Identity of the issuer or the underlying issuer Software Radio of existing shares to which voting rights are Technology PLC 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 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 Smaller notification obligation:iii Companies Trust PLC 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 13th April 2012 reached:v 6. Date on which issuer notified: 16th April 2012 7. Threshold(s) that is/are crossed or Holding has gone above reached: vi, vii 6% 8. Notified details: A: Voting rights attached to shares viii, ix Class/type of Situation previous Resulting situation after the triggering shares to the triggering transaction transaction if possible Number Number Number Number of voting % of voting rightsusing of of of shares rights x the ISIN CODE Shares Voting Rights Direct Direct xi Indirect Direct Indirect xii GB00B0M8KM36 4,263,775 4,263,775 7,120,731 7,120,731 N/A 6.71% N/A 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 % of voting rights xix, xxfinancial price date xvii Conversion voting instrument period xviii rights instrument refers to Nominal Delta Total (A+B+C) Number of voting rights Percentage of voting rights 7,120,731 6.71%

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

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: BlackRock Threshold Reporting Team13. Additional information: 14. Contact name: Andrew Manchester 15. Contact telephone number: 020 7743 5773 Enquiries:

Software Radio Technology plc 01761 409500

Simon Tucker / Richard Hurd

Westhouse Securities Limited 020 7601 6100

Richard Baty / Petre Norton