I've checked my insect book and the nearest I can find is an 'Empid Fly' Try contacting this website they may be able to give a definite identification. https://www.naturespot.org.uk/taxonomy/term/19434
A gardener's work is never at an end - (John Evelyn 1620-1706)
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Try contacting this website they may be able to give a definite identification.
https://www.naturespot.org.uk/taxonomy/term/19434