Hi mate, and welcome to THL, hope you enjoy your stay!
Now, i notice you say you are shooting in a dis-used quarry - just because it is dis-used doesn't mean its not owned by someone. Please (to cover your own arse bud) make sure you can find out who is the owner, and get some written permission. Saves you SOOOOooooo much heartache in the long run. Add to that the bonus of B.A.S.A membership is that you will be covered by an insurance for when you are shooting. B.A.S.C do itas well , but as they are a firearms type org, their membership is more expensive - i guess due to the nature of c