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It does look most like a palmate newt (the dorsal stripe is reasonable common in palmate newts and very rare in smooth newts) and given its location and habitat I would think this is most likely, so I agree.
Palmate newts are now in the genus Lissotriton. If you add another ID with this name it will hopefully link up to other sightings of this species.
Thanks very much for the helpful notes. I'll amend the genus name.
Lat/Lng: 57.4602, -4.3725
OS grid ref: NH577435