In the unsophisticated broadcasting years of the 1950s, when many programmes were broadcast live, timings were not always accurate. The BBC filled in with announcements or with short pre-recorded pieces of film known collectively as The Interlude. Typical interludes included: The potter's wheel, The spinning wheel, The white kitten, angel fish, horses ploughing a field, and a speeded-up train journey, London to Brighton in four minutes. Each of them said something about British heritage, and in subtle ways reinforced British middle class values.
This film provides an interesting retrospective and commentary on The Interludes.
And here is the famous London to Brighton in four minutes sequence in its entirety.