I gave up my Brocock collection and didn't recieve a penny in compensation, I doubt this would be any different, As stated these were untraceable as bought in various places both new and secondhand, but why risk being in possession of what was then deemed an ilegal firearm, As also mentioned many had these and weren't or aren't even aware they were no longer legal, I saw a chap selling an Orion at a bootfair, he commented when I looked at it, that it was perfectly legal as was only an airgun, I informed him otherwise and got some info up on my phone just as friendly advise, he was genuinely shocked, removed it immediately and asked my advise as to the best course of action, he then mentioned that he was selling as didn't really use em much any more and had two the same!! My collection was probably worth the best part of a grand, I got nothing!!
At the moment it's a wait and see situation, I'm not rushing to sell anything off but if the time comes when I do need to will not hesitate to do so whether I like it or not, I love shooting too much to risk getting caught out with something ilegal that would almost certainly further prevent me from enjoying what I can of the sport. The hope is that the situation will be treated for what it actually is, the Brocock ban was placed more for what the guns "could" be rather than what they actually were, a very different situation to the current concerns.