Gun violence in Britain has skyrocketed? Well, I suppose you could say that. They had 41 deaths due to gun-related violence last year, and their low water mark was eight. So yeah, maybe that is a "skyrocket" - mathematically speaking - it's over a 500 percent increase. But if you are using that as an argument against gun control, you're doing it wrong.
Norway, which had its own horrific massacre a couple of years ago and has strict gun laws, had two gun-related deaths last year. Two. The USA had more people die by toppling vending machines on themselves.
Banning all guns will never work, and realistically, that shouldn't be a motivation for anyone seeking legislative change. Between hunters and folks who just feel safer with a gun in their bedstand, there's room in a free society for responsible adults to have them. But there has to be something in between an all-out ban and where we are now, where our peer group, gun-related death wise, is Mexico, Venezuela, Honduras, and the Phillipines, and any whacko can easily get automatic weapons. Even the Norwegian whacko got his ammo from us.