Thank you. I am not British, and I had forgotten that particular fact. Technically, the concept of "adverse possession" exists in Canada, as well, but in practi

Thank you. I am not British, and I had forgotten that particular fact. Technically, the concept of "adverse possession" exists in Canada, as well, but in practice it doesn't really come up (either eviction proceedings occur quite quickly or in the case of a small piece of land--a fence in the wrong place, perhaps--the owner may "give permission" which is enough to maintain ownership rights). I suspect that it does not come up often in the UK, either. Post-WW2 was a bit of a special case. Anyway, the land in your example was not really "unowned." Rather the legal owner was different than the occupier, and turned out to be missing. I was referring more to the fact that the Crown is the ultimate legal owner of (essentially) all of the land in the UK (and Canada and other countries for that matter). Anything that does not have any other legal owner is definitely owned by the Crown. What would be called government land in the US is called Crown land in Canada (and presumably in the UK?).