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How big was this?
It doesn't really look like a great crested newt larvae, or a newt larva at all. It might be a fish larva. Although you do get great crested newts in very close, there's too many fish in Hatchett pond, which eat the newt larvae.
Lat/Lng: 50.813666666667, -1.4793333333333
OS grid ref: SU367016