The Critics Group was never a band, but individuals in a song workshop run by MacColl.
The Festival of Fools was the only venture they ever did all together (apart from political shows at the time of the Viet-Nam war etc).
Material for the London albums was researched by Group members, mainly from published broadside collections like Roxborough, Bagford, Ashton etc. Tunes were gathered from various sources - Simpson's The British Broadside and it's Music being a main one.
Waterloo-Peterloo never made it to CD (yet) but there were rumours that Topic were going to re-release some of the albums.
Scotsman Bob Blair issued a CD some years ago on the Living Tradition 'Tradition Bearers' series and works regularly with 'Stramash' in Glasgow.
Jim Carroll