And British Telecom reckons that the market has changed so much since it acquired 51% of Mitel Corp in 1985 that the restrictions then imposed on its marketing of Mitel products in the UK are no longer justified, since its and Mitel’s share of the market have both fallen since then, and the creation of GEC Plessey telecommunications has increased competition from that quarter: it is therefore asking the Office of Fair Trading to lift the ban on joint marketing with Mitel.