Well, the Ealing comedies do pop up on Boxing Day. So I guess that counts as TV. Not to mention the old St. Trinian's movies.

It's amazing that the Beeb was as cavalier in its archiving material. Some of the old British TV and Radio shows were saved because the shows were exported to other English speaking countries, which had the knowse to save the shows.

Pleater, try Old Time Radio Show Catalog (OTRCAT) as they have a catalogue of old British Radio. They have such things as Doctor at Large, Doctor in the House, Goon Show, Hancocks Half Hour, I'm Sorry I'll Read that Again, Navy Lark and Round the Horn in MP3 format.
http://www.otrcat.com/british-c-103.html

Unfortunately, they don't have the Archers.

So, pleater, you don't have to regret that I gave my Revox B-77 Reel-to-Reel to a church and not you.

McClef, how about the Red Cap with John Thaw version, not Tamzin Outhwaite one?