Believed to be a Badger sett, due to the extensive excavation. Near the Domar Road entrance to the reserve.
The second photograph shows the general location.
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It looks like a sett, right habitat. However, I'd need some idea of scale to be sure.
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Lat/Lng: 52.3942, -2.2701
OS grid ref: SO817773
Located near the Domar Road entrance.