Within my memory, there used to be a regular 'sing-song' at the local pub, where someone sat down at the piano, and the regulars all sang whatever he played.

This was not a club, nor was it folk, just people enjoying themselves, and no-one got paid anything.

It is social gatherings like this which, as far as I know, never thought about the PRS, in fact had probably never heard of it.

Still, the last few have probably been killed off by the PEL anyway.
I believe social music is still alive in pubs in Scotland, where the new PEL does not exist, and in Ireland. Pity about us in the 'Land of Song'