It was definitely Jenny Bellamy in Taffy's 1987 production, MtheGM; download the MP3 (The Transports - Folk on 2, 1987) and hear Jim Lloyd confirm as much in the credits. As I say, video footage of this production exists - I have it in part (only two songs: Abe Carmen as sung by PB & The Green Fields of England sung by PB & JB) but I hope YouTube will prove a suitable platform for that wider audience of such archive classics.

Some choice playing by John Kirkpatrick in there too - his tender variations on The Leaves in the Woodland are among the many highlights on offer here; one almost feels tempted to resent PB's narration!