Re: "no requirement of 'registration' for deactivated firearms"
...and hence the wishy washy following of the EU directive by gov.uk. This is how EU directives work. Each country gets to implement it in it's own way, within reason. Much of the time, the UK "gold plates" the Directives then points at the EU and say "not our fault guv" to the UK population. Usually because those Directives were instigated, amended or just strongly supported by our government.