With a lot of nationalities less good / patient at queuing as we Brits I can imagine, if things get as bad as BAA are hyping them to be, then it's more than likely that tempers will fray, and eventually impatient travellers will "gate crash" the border agency desks; added to which there will be disorder on flights where passengers are held on board. Will the police and security staff be able to cope with such disorder? I doubt it.
Frankly I wouldn't blame passengers is they did gate crash their way in.
Surely to prevent this happening the Border Agency should allow free flow of EU arriving passengers through the border (a la Schengen) for the day, and use what resources they have to offer a decent level of checks to non EU flights.
Simples! But I doubt that Theresa May nor her friends at the Torygraph, Mail and Sun would countenence such a sensible move.
As for the strikers, I suggest they join the rest of us in the real world, pensionswise!