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As there are only inconspicuous dark marks on the wing edges and the head is not dark, I'd vote for the common E. briggsi. If it is a female, however, E. meridionalis would also be an option (that species is obligatorily parthenogenetic). The British key https://www.brc.a...-E2-F1.htm is very useful but does not cover all species. To be on the safe side, use the great paper by Lienhard (https://faunedefr...8re%20.pdf). In several cases only the genitals are decisive, though.
Regards, Sundew