Scallys in Weston-super-Mare opposite Dolphin Square is a lovely biker friendly pub, live music etc. Unfortunately it may be knocked down soon due to refurbishment of the whole of Dolphin Square
The BA in Weston again, short for Bath Arms I believe. The Van Diemans have their meets here on Thirsday evenings. Admittedly I've never been but apparntly it's fairly nice.
The Watchfield in Watchfield, just outside Highbridge. The NABD and various other clubs/groups have meets here now and then, there's camping out back (Around £3 pppn) and as long as you don't mind snotty landladies it's a great pub.
The Skirrid in Wales is another good one. A few of us have been camping up there before, we always meet there before going down to the campsite. It's actually a National Park not really a campsite, and so long as you don't mind making like a bear there's no one around for you to bother or vice versa.