It is about 5-6 inches long, short legs & tail, slender body.
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The demarcation between the brown and white fur looks quite wiggly (straighter in a stoat) which is why I've agreed with weasel (also the small size).
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nice to see...
small size give it away..
Lat/Lng: 51.3772, 1.2578
OS grid ref: TR268692