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I'm intrigued how you identify down to species level at the nymph stage. What should I look out for to separate this from, eg, Southern Hawker?
There are a number of different features that can be used to identify dragonfly nymphs, but specific ID generally requires close examination.
In this case none of the diagnostic features can be made out in the photograph, so I cannot go any further with the identification other than to say that it is an Aeshna species.
To identify members of this genus to species level, the shape (and measurements) of the labial mask on the underside of the head are one of the better features, with total length of the larva, presence and length of spines on the side of the abdomen, and the precise shape of the tip of the epiproct (the central appendage at the end of the abdomen) also useful.
Take a look at the photos on this excellent website:
Thanks Roy. That's very helpful.
Lat/Lng: 53.8, -1.7
OS grid ref: SE2036