First off being in the US I can no longer see any BBC4 progs. I was a devoted fan of OGWT it was a transformation after having only Top of the Pops to watch, so I was devastated about 5/6 years ago there was a BBC4 prog (was still living in England at the time) and whistling Bob let slip that most of the artists were miming on the OGWT. For me that killed the program right there.
As for drummers. Dave Mattacks apparently pissed Dave Swarbrick off so much that Swarb nailed a tambourine to his dressing room door. Keith Moon was on so many drugs he hadn't got a clue what he was hitting.. coke, heroine.. whatever.. That's why you drive your roller into your swimming pool.
To distract this thread slightly, a lot of people consider Ginger Baker (Cream for those who don't know) as one of the best beating the skins. I would suggest anyone wanting to discover more re drummers, they listen to Michael Giles (King Crimson)especially on 21st Century Schizoid Man.