The episode titles "1964", "1966", "1967", "1970", "1974", "1979", "1984", "1987" and "1995" were the years in which the action took place. Many of these (1964, 1966, 1970, 1974, 1979 and 1987) were years in which General Elections took place in the UK, against which the events of the episodes were set.
Because of earlier production problems the scenes of the polling station and most of the whole episode had to be shot again, originally this was shot in the winter months, but had to be re-shot in the summer months and made to look convincingly like it was cold.