I'd agree for a worldwide basis, but the original poster was talking about the UK - I'd say it's pretty clear cut across the UK on what is and is not acceptable for airport security.
I fly twice a week, generally Glasgow to London Airports, but occassionally to others - it's the same at every airport in terms of what you can pass through with - that's not rocket science.
Not true. This week at LHR T3 I was asked to remove my belt. Not mentioned on their 'idiots' board and not required on the adjacent queue!!. When enquired why was told "because I say so"