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It looks quite large for a minnow - are you sure it's not a juvenile fish ? Maybe a roach or dace ??
Plenty of Minnows get that big. Young fish of species like Dace, Roach, Chub and so on do not have the dark line along the middle of their flank; they are wholly silver. This is a normal colour for Minnows.
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Lat/Lng: 52.9, -1.5
OS grid ref: SK3535