Very few get passed by the licencing lot nowadays cos too many people put their glasses on the handrails and they fall onto people below.
The ones they do have often have a bouncer pretty much on "Don't put yer drinks glass on there" duty.
Also a lot of pubs don't have much in the way of level surfaces in the toilets so there's less places to snort coke off and with fuckall customs checks nowadays the stuff is fucking rife.
I've worked on a few barfits over the years up and down the country and get to see how they go.
Oh and ice machines don't get cleaned out much at all. You might want to think before you go for the ice.
Also if (when) rats get into the cellars they piss all the time they walk... over the bottles and whatever else.
You might want a glass with that beer instead of drinking it directly out the bottle.