Indeed, I gather it is now a criminal offence in the UK to sell or even give away a deact that is not up to the current 2018 UK/EU spec. You can keep the old spec deacts without authority, but you can't move them on without bringing them up to current standards. I don't know much about it but from what I can gather the latest spec necessitates the trigger being disconnected from the sear or the sear from the bolt. The bolt can move but in simple terms the rifles can no longer dry fire. It's got nothing to do with safety & everything to do with discouraging people from wanting to own them in the first place. Make them unattractive & people might not want them any longer. After all, nice, switched on, socially aware people wouldn't want to own a gun in the first place.................would they......?
At least in respect of bolt action rifles there was nothing wrong with the most recent UK spec., nor, for that matter, was there anything wrong with the UK/EU 2016 spec. But, they could still be dry fired........heaven forbid, you might enjoy owning one!