I think its a rabbit burrow but it seemed a little large and it had three holes. Was in a bankon a track near woodlands, fields behind and horses.
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This looks much too small for a rabbit, I would suggest a mouse or vole, you may have seen little piles of debris from seed husks etc just below the entrance to the holes.
You are probably right went back to see and was traces of acorns and stuff near by
Using the leaves for scale I think this is probably a wood mouse hole.
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Lat/Lng: 53.6, -2.6
OS grid ref: SD6221