The Skorpion Submachine Guns they are complaining about are not in British homes waiting to be burgled.
They are smuggled into Britain by organised gangs and are acquired from European underground sources including illegal copies.
Skorpion SMG "capable of firing 850 rounds per minute" Pfft Capable of firing a 10 or 20 round magazine at a cyclic rate of 850 rpm. Brrt brrt and it's empty. Count magazine changes 850 rounds a minute is impossible to do. A 12ga double barrel shotgun can fire 18 buckshot pellets in a second (two rounds of 9 #00)
I am tempted to dig out my copy of HARRY BROWN (the Michael Caine movie about a pensioner in a bad neighbor, often called the British version of DEATH WISH). Harry Brown's nemesis is an underground armourer supplying drugs and guns..
cut'n'paste from me:
Gavin Hales, Chris Lewis and Daniel Silverstone,
Gun crime: the market in and use of illegal firearms, Home Office Research Study 298, Home Office Research, Development and Statistics Directorate December 2006.
http://www.ligali.org/pdf/home_office_gun_crime_the_market_in_and_use_of_illegal_firearms.pdf
"Home Office Research Study 298 Gun crime: the market in and use of illegal firearms" by Gavin Hales, Chris Lewis and Daniel Silverstone, Home Office Research Study 298, Home Office Research, Development and Statistics Directorate December 2006.
[my summary:] This study into the criminal gun culture in England and Wales included a short survey of 80 incarcerated gun criminals and gives a good view of the street criminal view of gun crime in the UK.
I come away from that read with the impression that banning civilian guns has not disarmed criminals, but created a class of criminal known as "armourer" who serves as a source for criminal weapons: trafficking stolen or smuggled guns, repairing or modifing guns, converting blank guns or deactivated guns to fire live ammo, or using replicas or air guns as frames for zip guns. UK inmates told interviewers that they could have a gun within a week of release, including submachineguns if they had the money and wanted one.