In reply to jkarran:
Right, That's good to know! The blocks are very solid, no movement at all.
You would need an absolutely massive amount of leverage force to move them anyway! Some gaps go back quite far into the wall, so my main concern was with loosing the smaller cams from walking too far in. The granite is also quite rough so I don't see them slipping or poping out really.
Oh and with regards to the EA, They have never stopped us top roping or bouldering the lower sections so I'm hoping they will leave us be!
Thanks for the advice, I will use my judgement and test the placements on top rope first!
max