The Public Telecommunication System Designation (Mercury Communications Limited) Order 1984
Whereas the Secretary of State has granted to Mercury Communications Limited a licence ("the Licence") under section 7 of the Telecommunications Act 1984(a) ("the Act"), to which section 8 of the Act applies, for the running of the telecommunication systems specified in Annex A to the Licence ("the Applicable Systems"):.

(a) 1984 c.12.