Was thinking about splitting the regions as follows :
Derbs, Lincs, Notts, Leics, Rut [1]
Northants, Hunts, Cambs, Beds [2]
Norfolk, Suffolk [big counties] [3]
Ox, Bucks, Berks [4]
Herts, Middlesex, Essex [5]
Surrey, Sussex, Kent [6]
Wilts, Hamps, Dorset [7]
Somerset, Devon, Cornwall [8]
Herefords, Worcs, Warks, Gloucs [9]
Shrops, Staffs, Cheshire [10]
Yorks, Lancs [11]
Durham, Northum, Westmorland, Cumberland [12]
Done that by looking here :
http://newfamilyhistoryengland.googl...tyMap-full.jpg
obviously if your on a border of counties, say Gloucs [9] and it's easier for you to get to Ox [4] then by all means, do.
It's up to the individual really.
But that gives you a basic idea. Anyone better at geography, feel free to rearrange areas. But that's a basic idea, and I think workable. Obviously if you really want to go to a session, but it's out of your area, then fine, but make sure you let the organiser know

Will have to sort out organisers for each area etc