A man from County Durham, whose mother, sister and aunt were shot and killed, has travelled to the capital to try to change the gun laws.
Bobby Turnbull will meet with the Association of Chief Police Officers later today.
His family were shot dead on new Year's Day 2012 in Horden.
The Labour MP for Easington, Graeme Morris, will be leading a debate in Parliament later today on whether the Government should have tougher regulation surrounding the issuing and handling of firearms.
He has been campaigning for tighter gun laws in conjunction with the Horden shootings, where three members of the Turbull family were shot dead by gunman Michael Atherton.
Atherton held a gun license, despite several police call-outs to his house for domestic violence and a suicide threat.
Bobby Turnbull has been leading the calls for changes to the gun laws in the months following the shootings.