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Take it lying down poster
One consequence of the Post Office running the UK's phone system as a monopoly was that choice was severely limited.
In the early 1970s, you had a choice of a couple of phone models in six colours, and that was it. It was illegal to fit a phone extension yourself — indeed, to connect anything to the phone network that you didn't rent from the PO.
Extension phones were seen as rather exciting luxury items — although professionals such as doctors or vicars who might expect to be rung at home during the night qualified for a free extension. Sometimes, even more innovatively, they got a phone that could unplug from the wall.
Image credit: BT