LOST: British MONOPOLY Game

LOST. This is a long shot. Our family game of many years, disappeared quite a few years ago. When my parents died, we figured it was in their storage. Wasn't. Mum must have given it away or sold it, I'd guess (wait for it....) about 20 years ago, but maybe less. We were looking forward to seeing that again. If you know of its whereabouts, we'd appreciate hearing about it. Maybe we can make some arrangement to get it back. Picture shows what it looks like (from internet). It had metal tokens. We are only interested in getting back this particular game, not another to replace it, because it is the sentimental value that is important to us. Either Mum gave it to a friend of ours, a homeworker, or it got sold in a garage sale (don't think the latter, we would have seen it, but who knows). Thanks.