Man with a microphone was on this album, (and possibly others).

"Sydney Carter and Jeremy Taylor at Eton"

Released in 1967 on the Fontana label.

Disk No: STL 5418

I don't know if Fontana is still going,(was it part of the Philips
group?) or where they could be contacted.

Sorry I can't help any more.

Cheers for now

Cattail !