There are two series. The first is a beautiful evocation of schools TV science programmes form the 1970s/early 80s, even including the voice of Nigel Lambert, the original narrator of Experiment, the show on which it is primarily based. Having Robert Popper in there helped too.

The Butterfield stuff is just amazing. The Butterfield Diet Plan sketch is utterly fantastic, just with the ridiculous food names piled on thick and fast.