A very long time ago (…and very long story…) EMIson sent me a reel of various items, including cuts from Pennine 1975.
As ever, have you any audio examples of what you’re after, any quality, any source?
I may be wrong, but possibly after that they may have gone to Alfasound (as many stations did).
There’s JMers much more knowlegable than I’ll ever be on this one!