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I agree with Gill and think this is more likely to be a pygmy shrew:
1. Tail looks like it is more than 50% of the body length (Common shrew is about 50% of body length, pygmy is more like 70%)
2. There should be two tones of colour to the fur (mid brown on back and paler on belly), but it not easy if light is not quite right
Good spot though!
Lat/Lng: 54.914119, -4.893733
OS grid ref: NX146615