For a long time I have subscribed to the YouTube channel of the BBC Archive. In its earlier days, the channel posted selected clips from programmes, more like teasers, leaving the viewer wishing they could watch the entire programme.
Happily, in more recent times, the channel is uploading full length programmes. There are some oddities, but also some real gems. My favourites tend to be from the 1950s and 1960s. Here is an excellent example of the breed: Rathlin — the Island Betwixt and Between.
Of course, once I had watched the film, I opened up Wikipedia and searched for the island to find out more.

