Just assume that a variety of clueless jobsworths whose lives will never amount to anything will try to make your life a misery. They will treat you like dirt; make unreasonable demands of you; employ some tactics which, oddly enough, are also worth considering if you ever find yourself needing to interrrogate people without being fettered by the Geneva Convention; delay you; and upset you.
There are, needless to say, no meaningful national guidelines worth speaking of in the STBIROTFUK, as 'confusion benefits the system'.
Note of caution: This has nothing to do with achieving a more secure environment, so BE CAREFUL!