And this is why we have a problem with security. Their procedures are as opaque as they are variable. Very kindly they refuse to say what you can and can't do and then shout at you for not complying. I'm guessing they won't publish their procedures in case they are criticised by the public for not following them. It's a shame that the people who work in airport security forget who they are paid to protect. Unless of course, they exist only for themselves; which at times I believe to be the case.
PM