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Tail in second photo looks a little pin like at the end I think.
I will add another photo showing tail to see if that helps
I don't see a filament and the wavy crest is typical for a male smooth newt.
Photos not very clear but I think tail is more sharply pointed rather than abrupt end with a filament so I think you may be right.
I agree no filament. :)
Go by the hind feet with fringes / flaps of skin in Picture 1 and the wavy crest in picture 2 - both these are only found on male Smooth Newts. If it were a Palmate Newt it would have webbed hind feet and no wavy crest.
Tachinid Recording Scheme
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Lat/Lng: 50.938009166667, -0.49383138888889
OS grid ref: TQ059164