Theres quite a healthy rocketeering scene here in good ole Blighty. As far as I can remember a lot of them meet on places like old military bases and big expanses of sand , fields and such. The local authorities here in the U.K can get a bit pissy about this sorta stuff.
Theres also loads of web sites on it too, even some quite good ones on how to make your own rockets and also your own motors. Good plans and also exact meeasurements for mixing the household chemicals to make "safe" motors. My boss mixes his own for his kids, Which is quite scary as I wouldnt trust him to light a light bulb let alone a potentially dangerous rocket motor.