How effective has the 25-year ban on pistols been since the Dunblane massacre?

Twenty-five years ago on Saturday, the Government announced its plans to ban the private possession of virtually all pistols in the wake of the Dunblane massacre. The anniversary went unmarked as the country reeled from the death of MP Sir David Amess, who had been stabbed during his constituency surgery in the quiet coastal town of Leigh-on-Sea.