EGBKFLYER
I sympathise with the problem.
Perhaps your first course of action should be to discuss this with the airfield authority/owner to find out exactly what set of rules are in force.
1. How do you know someone isn't stealing a plane?
2. How does the pilot know any essential airfield information?
3. What about terrorism/smuggling?
......the list goes on.......and if you are ever visited by the Authorities they may take a dim view of such lax or non-existent record-keeping, but I repeat .....go to the airfield authority first...
...there may be an alternate method of movement notification.