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This was taken today Jan 1 2019 southern England, Swindon, Wiltshire.

It is approximately 3.5mm long with 2mm wing length.

I have keyed it to Chironomidae, Orthocladiinae, Metriocnemus, Thienemanniella at which point my confidence ran out.

Could I ask for some help with this please.

Thanking you in advance.

Marc Taylor