As Reuters noted, the Dunblane massacre led within two years to gun control laws that effectively banned civilians from owning handguns.
Britain had tightened regulations after the 1987 Hungerford massacre, which also killed 16 people, said CNN. The Firearms (Amendment) Act 1988, as it’s known, made registration of shotguns mandatory and banned semi-automatic and pump-action weapons. Firearms amnesties after Hungerford and Dunblane netted thousands of firearms and rounds of ammunition.

CNN noted that while the ban initially seemed to have little impact, the number of crimes involving guns have dropped in recent years. In 2010/2011, there were 11,227 offenses, 53 percent below the peak number. Crimes involving handguns also dropped 44 percent between 2002/2003 and 2010/2011.

http://www.msn.com/en-us/news/world/do-gun-control-debates-ever-change-anything-in-these-countries-they-did/ar-AAgZeKM?li=BBnba9K