750XL
I wish it were that simple, the UK regulations are very prescriptive but in my experience the airports I mentioned above seem to invent there own rules.
We had problems at STN, having contacted the head of security to clarify the situation and him attaching a copy of the rules to the desk at the screening point but the same problem reoccurred on an almost daily basis. Even when we pointed to the rules the attached to the desk at the security point the screeners seemed unwilling or unable to read and understand the rules.
In my view it is not the rules that need changing but the culture if aggressive behavior of the screening staff.
To say that if you stay within the rules is simply fails to understand the situation.