It sounds like you guys in the UK have it rather bad.
In NZ the Aviation Security staff have to now be screened like any other crew or passenger. It was a small win for us.
Is the airline industry well unionised in the UK. Couldn't you use these security procedures as a barginning device with your airlines for meals to be provided? or atleast drinks.
The Aviation security here also enjoy having there power trip over crew and passengers alike. They seem to be the same the world over, thinking that they are personnally saving the world.
Best of luck! Sounds like you need something to change.