Loads of info about this here

http://en.wikipedia.org/wiki/Madhouse_on_Castle_Street

The only copy of said play was junked in the late 60s, although some parts of the audio still exist (which is what your mate would have recorded).

Wouldn't like to pontificate about any lost "fortunes" though - I remember reading when they launched their "Treasure Hunt" appeal (qv) that the Beeb weren't in the habit of paying much if anything for returned material. A clean digitized copy of your source and a pat on the back were on offer, though.

on the 'Where Are You Now My Blue Eyed Son' b**tleg set.

There's versions of Blowin' In The Wind and The Ballad Of The Gliding Swan but, trust me, they're for completists only!

.....http://missingepisodes.proboards.com/index.cgi#active

I'm a bit of a TOTP buff and they seem to be knowledgeable on all the lost stuff and also new rarities whenever they appear from under somebodies bed.

I remember it was shown around the same time as the Martin Scorcese Dylan documentary, and I was blown away.

Told a really focused story, and really set the scene well with good background info about the winter of 1962. Really well made film.