Have you seen how high Britan's violent crime rate has spiked in the last 15 years (since they have had some draconian gun bans?)?
When guns are outlawed, only the outlaws have guns. And they know it.
Sorry but while you are correct about the UK they still only have a fraction of the firearms deaths that we do and violent crime rates in Australia and Canada have declined or remained at very low levels with their restrictive gun laws, especially ones with firearms involved. And overall violent crime in the UK is much lower compared to the US, so even with the 'spike' the rate is still got a long way to catch up to the US.
In all of the above countries, firearms account for only a fraction of violent crime deaths.
The United Kingdom (50 murders by firearm in 2005/6, and a overall murder rate of 1.4 per 100,000)
http://www.homeoffice.gov.uk/rds/pdfs07/hosb0207.pdf
Canada (183 murders by firearm in 2000, with an overall murder rate of 1.76 per 100,000)
http://www.statcan.ca/english/freepub/85-002-XIE/0090185-002-XIE.pdf
Australia (493 murders by firearm from 1991 to 2001, with an overall murder rate of 1.7 per 100,000)
"An examination of firearm related deaths in Australia between 1991 and 2001 found a 47 per cent decrease in numbers, with a fall in the number of suicides accounting for the largest part of that decrease........The incidence of both firearms suicides and firearms homicides almost halved over the 11 year period."
http://www.aic.gov.au/publications/tandi2/tandi269t.html
http://www.aic.gov.au/publications/tandi2/tandi261.pdf
And last but not least, the United States (10,100 murders by firearm and 5.6 murders per 100,000 inhabitants in 2005)
http://www.fbi.gov/ucr/05cius/offenses/expanded_information/data/shrtable_10.html
http://www.fbi.gov/ucr/05cius/offenses/expanded_information/murder_homicide.html
Justifiable Homicide with firearms by Law Enforcement accounted for 337 of the total while Private Citizen with a firearm accounted for 143 of the total in 2005, only 4.75% of the total.
http://www.fbi.gov/ucr/05cius/offenses/expanded_information/data/shrtable_13.html
http://www.fbi.gov/ucr/05cius/offenses/expanded_information/data/shrtable_14.html
Sometimes the facts get in the way of an argument.........