Just to update this story: I played the record to Steve Calloway and Chalky. First thing Steve said was "that's Uriel Jones" (the drummer, obviously) and I said that's exactly what I thought, he said yeah thats his signature 'fill', and he was one of my closest friends. So thats that bit sorted. They both thought it was probably (some of) the Funk Brothers playing on it. Meanwhile JM and apparently Keb both reckoned it was awesome and that nice JM bloke sold it for me to a very big name DJ, won't say how much for but it's the second most I've ever got for a record (the most was £2500) so I guess that'll be taking off very soon. JM and keb also think it's a girl singing, not a boy.
When I cleaned it up it sounded incredible, especially the break towards the end.
I cut one acetate, for myself. So that's that really.