Odd barkfly-like insect

Odd barkfly-like insect

Observation - Odd barkfly-like insect - UK and Ireland. Description: Stumped on this one. After id'ing almost all my barkfly pics I thought this would be easy but no. Wing venation very close to barkfly but for the odd semi-circular vein at the lower distal end. Very elongate too, with the wrong shaped head and very long b

Stumped on this one. After id'ing almost all my barkfly pics I thought this would be easy but no. Wing venation very close to barkfly but for the odd semi-circular vein at the lower distal end. Very elongate too, with the wrong shaped head and very long back legs. Can't see this is a bug nymph because wings fully developed. Help! About 3-4mm body length.