http://dvc.org.uk/dunblane/ssaagreenwood.html

according to this source more than 162.000 handguns were handed in
1997

plus, according to a BBC report,
quote:
Three months after the Dunblane massacre in March 1996, there was a national firearms amnesty that saw nearly 23,000 firearms and 700,000 rounds of ammunition surrendered.
This was considerably less than the 48,000 weapons surrendered after the Hungerford killings nine years before.
In January 2003 the killing of teenagers Charlene Ellis and Letisha Shakespeare in Birmingham provoked another gun amnesty.
Nearly 43,000 firearms and more than a million rounds of ammunition were handed in to police stations across the UK.
unquote

http://news.bbc.co.uk/onthisday/hi/dates/stories/october/16/newsid_3110000/3110949.stm