Smooth newt adults and larvae
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The other small newt in this country is the palmate newt, often easier to find than the smooth. I don't know if it's possible to separate the larval stages. Easiest way would be to look for an adult. Palmates tend to be paler, with a flat-topped body square in cross section. Male has distinctive black webbed hind feet.
Smooth and palmate adults are difficult to seperate outside the breeding season (March - June), larvae are almost impossible. As Bob says you are best trying to identify the adults. However, the larvae do not associate with adults so even this is no sure way of identifying the larvae.
I have put a detailed way of identifying adult smooth newts in this observation.
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Lat/Lng: 52.147569154474, -0.43849021196365
OS grid ref: TL069510