Gun crime in England [i]is[/i] "rare" by American standards. It always has been. The problem is, it's going [i]up[/i] - by double-digit percentages each year.
I've been studying this stuff for a long time, and here's what I can tell you:
From 1958 to 1997 the number of violent crimes (all types) went from 69 per 100,000 population to 674 per 100,000.
In England and Wales (a single political entity) during the twelve month period in 2000/01 where the data is collected, there were 7,362 recorded crimes in which firearms other than air weapons were reported to have been used. Handguns were used in 4,019 offences, an increase of 9 per cent on the previous year and the highest number since 1993. Two thirds of robberies in which a firearm was present involved a handgun. Remember, all handguns were banned in 1997.
Homicide in England and Wales reached a low in about 1962 and has been trending pretty steadily up since then. In the 2000/01 period there were still only 846 recorded homicides, and guns were used in only 9% (about 76) of them. The 846 figure is up 11% over the previous 12 months.
To give you a good idea of the homicide comparison, the number of homicides per million population for England & Wales was a minimum of about 6.8/1,000,000 in the late 60's, and has now trended up to 15.5/1,000,000 as of 2001, but that was a bit off because of a single incident in which 58 people died of suffocation. The actual ratio should be in the mid 13's. In the U.S. the ratio over the same period started at 73/1,000,000 went to as high as 102/1,000,000 and then dropped down to 63/1,000,000 as of 1998. But this isn't all that new. We've ALWAYS had a much higher homicide rate, all the way back into the 1800's. The difference is, ours bounces around. There's does nothing but go up. Slowly, but up.
England has never had much of a gun crime problem, so ANY gun crime gets people's attention. The problem now is that the criminals have no fear, and can easily get guns, so they do. The question of the British police arming themselves has come about because in some neighborhoods they've HAD to, and it looks to some like a slippery slope.
I've got several megabytes of stuff archived, that's where these numbers come from. If you're that interested, I can e-mail it to you.