Warning to British people visiting Poland!! Don't get drunk and smash the place up!

Yeah, TBH, when it comes to bad drunken behaviour, Poles and Brits are pretty much on a par.

That can be true. The bottom end of Nowy Świat in Warsaw has become a bit of a zoo over the past couple of years; the 'pijalnia' (mordownia even) bars have contributed to that.

In the UK, I've heard that it's mainly small towns that have problems, rather than large cities. Here it's usually the other way round, due to demographics and income levels.

You are right.
Not so much of a problem in London for sure.