The conversion of the Inland Telex Service to automatic working was completed.
A credit card service for inland and overseas telephone calls was introduced on 1 March (see also 1988 entry).
The CS 'Alert' (No. 4) was launched on 8 November.
The new engaged tone was introduced at Bristol to conform to international standards.
The first London STD exchange (Watford) was opened.
The cable pressurisation scheme was extended to include local cables from exchanges to cross-connection cabinets.
The first direct cable link between the United Kingdom and Sweden was laid.
Telephone No. 706 was introduced.