I live near high wycome, but am planning to travel and wild camp for a while so location is unimportant. My understanding is the mendip groups are not as active as i am looking for currently.
You’re understanding is quite wrong. Definitely get in touch with the Wessex - I believe there is a club trip on 9/10 that I am sure you’d be more than welcome to join.
I’m a Wessex member and was caving last weekend, Fri to Sun, including diving and plenty of ropey stuff, and I know plenty of other Mendip club members were out and about.
I’m nr Watford so not a million miles from where you’re based - I try and get out at least twice a month. The Peak District is also good for a day trip when time is tight.
Plenty of trips and things taking place in Wales and the grim north too.
But for now I’d definitely say join the WCC, meet some people and take it from there.
On the subject of the GSS, a friend has recently joined them and I’ve heard positive things.