Tamworths dope for the smaller rails, its a jib paradise on a good night and its groomed completely half way thru the session, so everything good.
MK has the biggest snow kickers in the UK easily and good rail setups, but only during events or at a significant snostorm and landings and kickers get pretty shitty quick and arent really maintained so much.
Cas' park usually kills it most of the time, kickers arent huge but theyre improving, all rails are good, from tech, big stuff to smaller rookie stuff.
ChillFactor has some alright setups aswell, damn good kickers and some sweet rails, worth a hit,
Can't talk for Hemel yet, looks pretty well maintained from what I've seen.