seen at janet Kear hide Martinmere near large pond
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The big ears and beady eyes are give aways of this. I can't see enough detail to say it's a wood mouse though.
It could be a house mouse, it certainly looks grey enough. A wood mouse would have much paler fur on it's belly. Did you see this? If fur is the same colour all over, then it's a house mouse (even if there's no houses nearby).
Lat/Lng: 53.62102, -2.86739
OS grid ref: SD427141