While trying to find out more about 'The Boatmen' I came across this Mudcat thread so perhaps I can revive it and add the limited information I have about this group and their recording :

www.waterwaysongs.co.uk/tunnels_mouth_details.htm

There have been some suggestions that David Blagrove was one of 'The Boatmen'. This was not stated on the lp but he obviously contributed several songs.

Does anyone know any more?