Thanks Peter, puts things in perspective....
I know cutaway rifles fall into a grey legal hinterland with ( from a UKperspective) it depends on your Police force as to how they are considered.
Several years ago I had this very conversation with my local Firearms team as to their take on cut aways.
The answer was they had never dealt with any, but could see they would be valid as part of a larger collection, to employ common sense and only buy from an RFD.
As keen shooters and collectors, amateurs and professionals alike, we all know what's 'potentially' viable as a firearm, (common sense part), so it's buyer beware, only purchase from an RFD and ensure with them its utterly incapable of discharging anything, with no reusable pressure baring parts, before you buy it.
I dare say that it's probably safe to say that those who have them in the UK should go with the side of caution and treat them as you would old spec deactivated Firearms ( defectively deactivated), so don't sell or give them away, or procure any more.