Thanks to a tip off from @SquidyUK, here’s something wonderful. Kaleidoscope has been donated the studio tapes from the recording of the Comic Relief special of Blackadder, The Cavalier Years.
As you can see, they’re not in the best of condition, but there’s some lovely stuff to be seen. They keep adding to this collection, so come back again and again to see what else has been added.
Tony Robinson is pretty funny when lines are forgotten.