As noted the resolution is not ideal, but the issue with gaps / overlaps between the areas is a rendering error on the telegraphs website only. The main issue however is the lack of clear licence. Perhaps try contacting the Department for Communities and Local Government and asking them.
As for a tag try "designation=green belt". Perhaps you could also add a protected_area tag as per the following proposal: https://wiki.openstreetmap.org/wiki/Proposed_features/Key:protected_area Regards, Rob
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