TETRA Exclusivity Agreement

SOFTWARE RADIO TECHNOLOGY PLC                         

                  TETRA EXCLUSIVITY AGREEMENT FOR SOUTH KOREA                  

The Directors of Software Radio Technology plc ("SRT" or the "Company") are
pleased to announce that SRT has signed an exclusivity agreement with its
existing customers, Unimo Technology Co. Ltd ("Unimo") and Mercury Corporation
("Mercury"), for the supply for SRT's TETRA handset technology to South Korea.

SRT signed a licence agreement with Unimo and Mercury for the development of a
TETRA handset in July 2005. Under the exclusivity agreement, Unimo and Mercury
will pay SRT an additional fixed fee, payable over the next 18 months, plus an
exclusivity premium on the per handset royalty in respect of sales made in the
Korean market.

Simon Tucker, SRT's Commercial Director said: "We believe this agreement
provides benefits for both sides. As an existing supplier of professional
mobile radio products to the Korean authorities, Unimo and Mercury were already
well placed to be a significant player in the TETRA market. This agreement
improves their position further with the expectation that they will gain a
greater share of the substantial Korean market, generating more royalties for
SRT at an improved rate."

Software Radio Technology plc                                    01761 409500
                                                                             
Simon Tucker                                     [e-mail]
                                                                             
Shamus Kelly                                     [e-mail]
                                                                             
Westhouse Securities LLP                                        0161 838 9140
                                                                             
Tim Feather                               [e-mail]

About Software Radio Technology

SRT is a developer and licensor of digital wireless technology reference
designs that facilitate and fast-track the manufacture of sophisticated digital
communications and tracking/surveillance products for use within the
professional homeland security market.

SRT currently licenses technology solutions for TETRA handsets (communication
devices used by professional users such as police & military) and automatic
identification systems (AIS) for ships and boats.

About Unimo and Mercury

Founded in South Korea over 20 years ago, Unimo now employs approximately 200
people and has annual turnover of approximately US$30 million. In partnership
with Mercury (formerly Daewoo Communications), a large Korean group which
manufactures fibre optic cable, Unimo is developing a TETRA handset using SRT's
reference design.