Touch a big fucking piece of wood with that title, BBC. Guns are much rarer in the UK than on the continent. This obviously doesn't make attacks impossible but it does make life harder for terrorists. For example, the maniac who murdered Lee Rigby with a knife tried to get a gun first. All he could get was a modified starter pistol that jammed on the first shot. The right wing terrorist who murdered Jo Cox apparently…
France has another issue besides lack of communication among its various police and intelligence agencies. It tries to enforce a very secular environment which included not allowing head scarves which just gives one side another excuse to resort to violence.