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Plugs, Sockets and Telephones (PST) The modern (dial) telephone was launched in 1959, in seven colours: two-tone grey, two-tone green, blue, red, ivory, black and topaz yellow. In the early 1980s it was still the standard telephone being provided for new installationsn and was coded on the Advice Notes as a 'mod t' (modern telephone). Plan 4 This was the earliest form of plug, socket and telephone combination, which used round type plugs (jack 95s) and sockets. Under the plan 4 scheme, additional telephones could be hard wired too. A trial of the modern PST (Plug Socket Telephone) system, using captive line jack units, took place early in 1981 in Taunton & Carlisle. The scheme was introduced nationally for residential lines, at the end of 1981 and later on for business lines as well. The marketing booklet from March 1982 encourages customers to 'Get plugged in'. PST Inphone Intro Products and Marketing Advice Notes (ANs)
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Light-Straw. Page last updated 14th
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