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Because this is a nymph it's hard to be certain whether it's a Velia or a Gerris, they appear quite similar at this stage. Someone else may know or you could return later to find out! Velia normally more on stretches of running water, so not sure about your site.
Lat/Lng: 51.622885879444, -1.0804796218872
OS grid ref: SU637919