I know that this has been aired on many occasions but since then the EU has issued three different directives regarding deactivating firearms. The first instructing even deactivated firearms to be "deactivated" again to bring them up to what they considered to be their new specification, the second some 18 months later then said that their first attempt at a new "deactivation" was not good enough so they had to be worked on yet again so that the only part that moved was the trigger and that was not allowed to be in contact with any other part. Now we come to the really good part having turned a deactivated gun into nothing more than a piece of welded up metal and wood which could only be used as a club you now have a legal requirement to register it with someone, in the
UK I think it is the home office, the fact that you actually own this totally useless piece of wood and metal.
The rifle in the original post could be owned by someone here in the UK but it would be illegal to sell, give, lend or dispose of it in any way except by handing it into the police or possibly giving it to a museum unless it had been brought up to the current EU specification including welding a rod into what is left of the barrel and welding all of the other parts in place.
Out of a matter of interest I took my sectioned / skeletonized No4 to the Birmingham proof house several years ago when the first directive came out to find out if it could be considered to be deactivated as just like the No5 in this post it was obviously way beyond the ability to discharge any form of projectile, I was told that unless the deactivation conformed to the then EU directive then it would still classed as "defectively deactivated" and I would be breaking the law if I tried to dispose of it.
Indecently I bought it many years ago at an auction but it had to be sold as a section 1 firearm even then as it did not have any form of certification to state that it was deactivated and the auction house quite correctly insisted that it had to entered onto my FAC where it still occupies a slot today.
We seem to live in a mad world and with the onset of Covid 19 its become even more so. Stay safe all of you and hopefully at some point we will pop out of the other end of it all a bit older and a damn sight wiser...