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It was just a show recorded for radio - just the four song set, and not a full length concert. As far as I recall, it was an experiment done as a sort of early stereo simulcast, so it was aired at something like 9.15 am, so that the listener could hear the performance on Network 3 in radio in one channel and BBC-TV (which was normally off air at that time of day) in the other.
I remember these 4 songs were on the radio back in 87 (I think). Excellent stereo sound, with Long John Baldrey as the host. I like this live version of Mona better than the studio version!
I think the Camden Theatre recordings had previously appeared on bootlegs prior to then, however.
The Camden Theatre belonged to the BBC from 1945 to the early 1970s and was used as a recording studio, so this would have been a session for radio, not a concert in the usual sense. The recordings are probably in the BBC's archives, unless somebody taped them off-air.
After the BBC left, the theatre was dark for a while, but is now the KOKO venue.