Cuckoo flower with invert

Cuckoo flower with invert

Observation - Cuckoo flower with invert - UK and Ireland. Description: Ticking all the boxes for the arrival of spring, there were butterflies attending these plants (did

Ticking all the boxes for the arrival of spring, there were butterflies attending these plants (did not capture the good side of any of them!) and only two weeks later I heard my first cuckoo nearby.
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I seem to have inadvertently captured an invert too, any advice on the ID of this would be welcome. I wondered about Platycheirus?? Its tarsi appear light in colour - or just bepollened? But I am well outside my comfort zone. Any advice welcome, of course. :-)