"checked with PRS about our monthly informal sessions, where
there's no admission charge to locals, neither are the musicians paid
PRS were definite that they do not regard this as a chargeable event.
There's been a lot of disinformation about sessions. I hope this
information clears up a few worries"

Very interesting because PRS gave the Blackmsiths Arms at Farlington a slightly different reply. We had the same kind of session (no admission fee, no paid artists) and were quoted a similar amount as a chargeable event. It doesn't really clear up the worry if they are telling different people different stories.