Long-time fans will love it, even if its charms wear a bit thin for anyone who doesn't already have Kurupt FM on their dial.

Rarely does a half-hour TV show successfully stretch itself into a 90-minute film. It's a nice surprise, then, that the popular BBC mockumentary works as a feature.

Rather than just pushing the characters through their familiar beats, the well-judged narrative arc takes them on something like a proper journey.

Above anything else, and vitally considering this is a film intended to make viewers laugh, it's just riotously funny. From start to finish, it's full of classic jokes in line with the tonality of the series.