I have read several articles in the past by British Constable and Fellow at Cainbridge, Colin Greenwood.
He seemed to me to be one of the clearest thinkers and most effective voices against gun control.
You should not compare Britain to other countries which have lesser or greater crime. You should compare Britain before and after they passed more and more gun controls.
Before 1919, Britain had no gun controls at all except the very minor requirement that you had to purchase a stamp at the post office to buy a handgun. The stamp was issued as routine. Other wise you could buy anything you wanted, mortars, cannons, machine guns etc.
According to Greenwood, during that period, the entire country averaged less than 5 armed robberies a year. Sherlock Holmes solved more murders than were actually committed in real life.
Now after some of the most harsh gun controls in the world, crime is in many ways higher than in the U.S. Burglary of an occupied dwelling is far more common in Britain than America.
Which relates to population density, ethnicity and cultural beliefs and character as factors.