Just checked the youtube on mandolinman's link above.
The side Winsters in (Winster Processional) followed by the maypole dancers. Then the maypole dancers do their dance while Headington Quarry dance Young Collins. It finishes with a snippet of Lads a bunchum.
The dancers are obviously real and probably the fool hitting the Dr with the pig's bladder, but is the bloke in tatters and funny hat their Squire or one of the actors dressed in morris kit?
So that episode takes place on Mayday!
Cheers,
Robyn