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Just found another picture of it. How many Parhelophilus species are there in the UK, out of interest?
Three species. I don't know them well enough to suggest which this one is, but perhaps Ophrys will weigh in with a species name.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
It's likely to be either frutetorum or versicolor. On the other side of the Wolds from you, on the edge of the Vale of York, I have only found frutetorum. I don't think that you can separate them from this photo.
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Just in case I ever see one again, what key features separate the two species?
Separation is not simple in the field - you need to catch them and use a lens, really, if not a microscope. In males, frutetorum has a projection with hairs on, like a little brush, on the underside of the hind femora. It is not always that obvious. Females are not so easy and it is probably not worth worrying, to be honest! There is also P. consimilis, but I have no experience of that species. Super little flies, but never common and you may well go some time before you see any more.
Lat/Lng: 54.25972, -0.41448
OS grid ref: TA033860