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In page Mornington Crescent (game):

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Humorous variations to the rules have been introduced to games. Humphrey Lyttelton would describe special rules to apply to that session, such as "Trumpington's Variations" or "Tudor Court Rules", so that almost every episode featuring Mornington Crescent introduced a variant. In one of them, first introduced in North Yorkshire, a player whose movement is blocked is considered to be "in Nidd" and is forced to remain in place for the next three moves. This tends to block the other players, putting them into Nidd as well and causing a roadblock. In one episode, every player ended up in Nidd and the rule had to be suspended so that the round could continue.[citation needed]