Hi Adrian
Lots of clubs around you ,Richmond , Darlington, Weardale, Middlesbrough and most will have some twinshocks at there events
I used to live in Darlo before i moved to Oz and rode at most club events all a good bunch of lads
As for what twinshock to get there are a few depending on what you like at the time and all can do the job as its more down to the rider (ty175,ty250,fantic200,fantic240 ,TLR250, TLR200
My fav is the TLR250 which i got for this season and it just feels right as soon as i rode it so its more about how you feel when you try the bike
Also picked up a TLM260 rf mono shock which is in bits right now but ran well when i rode it and should be back togeather in a month and they were suppost to be a well sorted bike so dont know what cleanorbust is on about
So pick a nice clean bike and enjoy
Mike