http://www.legislation.gov.uk/uksi/1991/1649/article/2/made
The Public Telecommunication System Designation (Unitel Limited) Order 1991
Systems development
King's Printer of Acts of Parliament
2014-08-15
TELECOMMUNICATIONS
The Secretary of State granted to Unitel Limited a licence on 9th July 1991 under section 7 of the Telecommunications Act 1984 to run the telecommunication systems specified in Annex A to that licence. A copy of the licence was laid before Parliament on 22nd July 1991. This Order designates those telecommunication systems as public telecommunication systems. Consequently, by virtue of section 9(3) of that Act, Unitel Limited will be a public telecommunications operator when the Order comes into force on 21st August 1991.
2
Each of the Applicable Systems is hereby designated as a public telecommunication system.