Similar problem at some places around Cambridge - I'll not name names, just in case! :-) But there seems to be disagreement over whether the "2 ppl" rule means more than 2 ppl playing at once, or just more than 2 ppl with guitars in total.

It also seems (according to local folk-persons, anyway) to only apply to organised sessions/gigs. So the word at a couple of places is that everyone's just turned up spontaneously, if anyone asks! ;-)

Graham.