Just to bring a bit of sense to this discussion. I've no idea what hapened to the Manchester programmes....probably dumped. I do know that most of the Pebble Mill recordings were "skipped" I know this because of my search for recordings of Nic Jones for the Unearthed project a few years ago. During this process, I spoke at length to both Peter Pilbeam, and Geoffrey Hewitt. Both of them agrred that most of the tapes had been thrown away. Of course, some lucky listeners will have recorded some of the programmes "Off Air" In fact, I have some tapes saved from that era. But, BBC policy at the time was to recycle the tapes....That doesn't happen nowadays. Everything is archived (because It's easy in the digital world)
Sad to say that a lot of wonderful recordings in the 70's were lost....Bugger!