It won't
It's a load of shit
the police will never enforce it properly
and if they do and some kid gets knifed in their area while they are all farting around with it
they'll have some serious questions to answer .
the police also hate doing this kind of work
it's completely non productive and pointless
nothing to get worried about i don't think.
it's more the venues being paranoid than anything else.
Lets hope so, the club scene doesn`t need any more hurdles