Compared to the aforementioned, UK citizens are just as murderous as any other European nation, but they like to do it with their hands and knives as guns are not readily available.
But not as murderous as gun wielding Americans or South Africans.
Nigerians are much more murderous, but they have very few guns. They like personalized murder, up close and bloody. Knife wielding Brits are much more murderous than knife wielding Japanese. But, overall, Brits are on par with Germans and Swedes, murder-rate wise, even though Germans and Swedes have more guns. A statistical dead-heat. Generally, Europeans, no matter what tool they use, murder themselves at a rate of 1.5 per 100k. Removing guns from the populace does no good.
However, I have read some very good statistical work showing that the number one reducing agent to crime is more police, period. That's it. More police to catch criminals and deter would-be's. You can have all the bans you want, all kinds of complex legislation, it doesn't add much at all. You can have all the personal firearms for protection that you want, too, and it won't matter. The US has many guns (both legal and illegal) in circulation. It also has some very tough anti-gun laws on the books. But, between two cities with tough gun laws, the one with lots of police has much lower crime rates, hands down. (You could mirror this in Britain -- lots of knives in circulation, those large cities with better police protection will have less overall crime and fewer homicides, I'd bet.)
From this, I guess that removal of guns from the American populace would not reduce the murder rate significantly. But putting more police in "hot spots" would.
And, suicides are a much larger problem than homicides in almost every country in Europe and North America. From a public health perspective, it is a horror show compared to homicide even though homicide seems to be the flag that everyone raises. Again, in this case, the tool does not matter. If there are no guns, people with jump, slash themselves, poison, or whatever else they can do.
An even bigger public health and safety nightmare, by orders of magnitude over even suicide, are auto accidents. There are more people maimed and killed, more money spent on hospitalization, etc for auto accidents than for homicide. No one would even think about banning cars, though. Even in Europe, people laugh at the idea of banning cars and enforcing excellent public transport that would be much more cost effective by many measures, and safer.
Yet, many Europeans are completely freaked out by the "US gun culture," and banning is the first thing touted as the cure. When the peaceful Swiss or Brits find the magic method to reducing their homicide rate to Japanese levels, I'll be impressed enough to listen to the advice they give. And, we'd all do well to concentrate on finding ways to reduce death and injury from cars and suicides before getting distracted with the much smaller problem of homicide, or the "evil of guns."