I don't know about the Britishicon, but I can tell you that a "Certain Intelligence Agency" in the US had many MK IIs & MK Vs stiin storage up thru the 1970s. I remember once seeing a silanced MK IIs, still in its original heavy cardboard "drop box", along w/the accessories, mags & intsruction pamphlet (in several languages). It looked looked to have never been used. They were all finally shipped to a US Army arsenal to be cut up & melted down, I think, around 1980. So sad.
Donzi