OR GETS DIFFICULT
•The BGA say:-
•that you cannot legally be prevented from leaving a property or taking your glider with you 
•That you could be expelled by force – but no more than is reasonably necessary and only after being asked to leave
•Your glider cannot be confiscated or impounded – which would be theft.  If you are prevented from reasonably retrieving your aircraft it becomes their responsibility – point out its value.
•If you are threatened – call the police.  They will not be interested in trespass (which is a civil wrong) but they will get involved in a case of threatening behaviour which may be a criminal offence.
•ALWAYS STAY CALM AND ACT POLITELY