You just have to accept the fact that escaped mental patients in the UK, invariably will end up taking refuge in the offices of airport security managers.
Once there, they will issue rules and procedures that would cause even Sigmund Freud to declare them beyond a lost cause.
To add to the fun they also ensure that the rules are different between each airport.
In the end there are only two solutions. Prozac or have your handling agent (try to) come to some sort of arrangement with security.