Why does anyone need a gun in the UK!? The US has 3.6 gun related deaths per 100,000 people, while the UK has 0.3. Politician in the US would have you believe knife crime makes up for the lack of gun crime, but the truth is that the US has 4 times rate of violent crime than the UK. There really is no legitimate need for civilians to own handguns.
It's true that the UK has a large number of surveillance cameras in towns and cities, but that's more of a reflection in the cuts to number of police over the years.