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I reckon the body and tail were only about 3cm (measured against items I happened to have with me which did not include a tape measure unfortuntely!). So given it also looks rather dark in colour, perhaps it was a pygmy shrew?
I meant: "body and tail were each only about 3cm"
Lat/Lng: 51.5042, -0.69007
OS grid ref: SU910791
On familiar path around lake