In my area (Central: Oxford 30 miles, London 45 miles)

Regular and reliable:
Late session in Oxford every Thursday and Sunday. (Pub)
Lunchtime (mainly music) session in Stony Stratford every Sunday (Pub)

It's probably best if you wait until 2-3 weeks before you come and then post this message again so it's fresh in everyone's memory.

Good luck

CamoJohn.