GoKarts / offroad buggys - where could i use it "legally" ?

[focced_off]

Hi guys,

I've been interested in buying a GoKart / offroad buggy for some time, something to play with, also for the educational / mechanical interest.
I don't own a field I could use it in, so what other options / locations are there??

I'm at the top of the M25, so somewhere reasonably close, however would be happy to 'cart it around' (pun intended) if needs be on a trailer.