Hi there.
It may be a little to far south for you but I can recommend Bourne in Cambridgeshire.
Other than location it fits all that you asked and they are a friendly helpful bunch.
I popped in to see them one day and 20 mins later I was in the air being checked out.
They operate 152s and as long as you fly north you are clear of any controlled airspace.
I dont have the number to hand but if your are interested, PM me and i will dig it out for you.
Good luck wherever you choose.