not a recent spot about 8-10mms
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Definitely a dolichopodid, maybe Dolichopus or Poecilobothrus nobilitatus (males of these have white wing tips, which they flick while courting on water surfaces, but I think this is a female.)
Nick Upton, naturalist and photographer.
thanks for the extra info nick
No probs. I got some pics of P nobilitatus courting with the males wing-flicking, but females are tougher to be sure of!
Lat/Lng: 50.9, -3.7
OS grid ref: SS8712