Your first link didn't work.
Your second link said 23 people were murdered with guns last year in Britain. (Washington or Detroit will suffer more than that in a weekend)
The third revealed this interesting tid bit
"Much is made of the higher American rate for murder. That is true and has been for some time. But as the Office of Health Economics in London found, not weapons availability, but "particular cultural factors" are to blame.
A study comparing New York and London over 200 years found the New York homicide rate consistently five times the London rate, although for most of that period residents of both cities had unrestricted access to firearms"
Exactly what moore was arguing in BFC that in america there exists this "culture of fear" that leads to the sense that everyone out there is sick and twisted and wants to bring harm to you.
Your choice of ariticle would appear to back up his claim.
The raw numbers do not show a major problem with gun murders in Britain, though, it would appear that crime is on the increase.