Uk have a bit of a legacy mess of systems. they use ordinance survey for mapping which is quite detailed for physical features (roads, fences, woods, buildings)

Uk have a bit of a legacy mess of systems. they use ordinance survey for mapping which is quite detailed for physical features (roads, fences, woods, buildings) but often doesn't provide actual property boundaries. they charge quite a lot (for reasonable reasons in some industries) to access this. the post office hold a separate database (also costly) of real addresses