customers to continue using their telephones. Service finally ceased on 28 February 1999. Former headquarters The former Ionica building was constructed in 1994 and is located on St John’s Innovation Park, adjacent to the A14. Despite an apparently desirable location the building remained vacant for much of the time since the demise of Ionica. CSR plc moved into the building in May 2007. References External links From the Internet Archive Defunct telecommunications companies of the United Kingdom British companies established in 1991 British companies disestablished in 1998 Telecommunications companies established in 1991 Telecommunications companies disestablished in 1998 1991 establishments in England 1998 disestablishments in England