Looks like some type of vole. It was seen in a small drainage ditch in the conservation area of the park.
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.... ears does it for me.
Shape and ears indicate water vole.
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I've removed my agreement from water vole whilst I ponder this one. Derek has considerably more experience than me, however, I'm not wholly convinced this is a bank vole.
I can see nothing to confirm size, the vegetation could suggest bank rather than water vole but that could be an optical illusion.
The colour and fur texture suggests water vole more than bank vole to me, however, that could be due to the animal being wet.
The ears are almost hidden, suggesting water vole, but then bank voles can pull them right back so it is not conclusive.
The eyes appear proportionately larger than you would expect for a water vole, again this could be due to the angle of the photos.
To be absolutely sure I'd want to see a side view with some of the underside showing, and/or some better idea of scale.
I think this one will have to stay a mystery unless you can remember roughly how big it was, i.e. was it the size of a mouse (around 8-10cm plus tail) or more like a small rat (13-18cm plus tail)?
Lat/Lng: 51.591466, -0.127325
OS grid ref: TQ298897