One three-part programme, The Happiness Patrol, featured a transparent caricature of Thatcher.
Sheila Hancock played Helen A, a big-haired despotic ruler of a human colony on the planet Terra Alpha, whose subjects – called "drones" – worked in factories.
The Doctor calls on the drones to down their tools and revolt, an obvious reference to industrial disputes like the miners' strike.
A year later Catrmel wrote a speech for the Doctor about the perils of nuclear weapons, which was based on material from the Campaign for Nuclear Disarmament (CND).
A spin-off children's novel called Turlough and the Earthlink Dilemma, published under licence by the BBC in 1987, also featured a villain called Rehctaht - Thatcher backwards.