Jim, a casual peek at The Critics Group in Wikipedia reveals:

In 1972 the principal performing members of the Critics Group broke away from MacColl's leadership and formed the left-wing theatre group Combine, which produced weekly events in an east London pub, the Knave of Clubs. They created songs, plays and other events in a similar manner to the Critics, culminating in the Vietnam Victory Show of April 1975 which celebrated the final liberation of Saigon.

Is this the theatre group to which you refer in your previous post, or is it a different set? Or (knowing Wikipedia), is the article flawed? Just curious. I went to Wiki to see who the members of the Group included - your name's there - and realised that I'd heard of some of them, but not others. Charles Parker I encountered at the BBC in my time there.

The article also mentions Christmas concerts at the New Merlins Cave in London - I pub I played jazz in regularly in the late 60s.