How do I remove duplicate features in OS MasterMap® Topography Layer?
Your OS MasterMap Topography Layer translation or loading software translator should remove the duplicate features that exist when data is supplied in geographic chunk format. If you have a GIS then it should be possible to run queries yourself to double check that all duplicates have been removed by the translation. You can also order OS MasterMap Topography Layer with no duplicate features, by selecting non-geographic chunks.