I am trying to do a research project on changes in Land Cover in a London borough over time. I have access to OS MasterMap data through Digimap (the service that provides this data to universities in the UK), but I can't see a way to download a time series of data directly.
I've noticed that the tables that are produced from the OS MasterMap data have a couple of fields that give the date the feature was changed, and whether the feature was New or Updated at that point. However, I can't see a way to use this data to produce previous versions of the map data. Is this possible to do? It would seem strange for them to include these fields if there was no way to process the data to make them useful, but I can't see anywhere that they say (for example) what was there beforehand, if this feature is new.
I have heard that the British Library have snapshots of OS MasterMap data from various times, but these are only available as images, not as GIS data.
Does anyone have any ideas as to how I could obtain a time series?