Ranges near essex???

[Cutch]

I am traveling down to essex from glasgow to pick up my track car on the 3rd & 4th of July. While i am down there i was wondering if any ranges were open that a non member can go to? I have a healthy interest in practical shotgun and have a couple of m&ps that i could take. Also have my competition licence for both. Anything on that i could tag along too?