These two words should NEVER be used together. Just to add to what I have already said about this subject in relation to our own laws in NZ, I would share this little bit which came out of the Canadian attempt to register each and every firearm (gun) in Canada.
They required that the MODEL number of the item HAD to be used, and to that end there were thousands of Ruger 10/22 rifles appearing for registration. Unfortunately for the poor sod who was doing the recording, the model number was accidently substituted for the SERIAL number, so noone actually knew who had which rifle!! And just to cap it all of, one overzealous cop DEMANDED that the owner register his WELLA SOLDERING GUN---I kid you not!!
So, if you live in the UK, get all those knives (and anything that remotely resembles a knife) ready for registration, and good luck to the STUPID politicians who dream up this crap! Its going to cost someone $$$Millions.