"The choice of evening may be a factor

Do punters cross pollinate to all 3 clubs? "

Maybe - Saturday night for the Wortley; Friday for the Rockingham Arms (Wentworth) - obviously popular nights, but Wednesday for the Rivelin, and a Monday club that's well attended too. Every night of the week is represented in a relatively small area (certainly by USA standards!!) and most seem to do well.

Cross pollinate all 3 clubs? - No