A male and a female I think, found 20 mins and 10 yards apart.
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The abdomen in image 2 appears to have a sharp contraction after tergite 5, typical of female brevirostris. Image 1 has very little dark on the hind femur - I mistook it for a shadow cast by the haltere - which again suggests brevirostris. There's a thin yellow stripe across the face above the antenne which I've not seen on several images of signatus and one of brevirostris, though the key does appear to allow for it. On coronatus the stripe is much wider and as bright yellow as the rest of the face, with legs all-yellow except for black at the basal end. Some rather tantalising as yet un-specimened images I suppose
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Interesting to know of any ecological niche they might be occupying...flowers/bee or wasp species they might be hanging around. Unlikely to be any up here, but worth a look, if there is similar habitat. Looks just to be bracken in deciduous woodland from the map?
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a straight hedge borders woodland, the hedge is mainly bramble for the first half, with many Conops quadrifasciatus, on thistle or occasional watermint. Walking downhill, the bramble changes to bracken and the flies suddenly start showing a yellow scutellum. Probably signatus of course, frequent around here - disappointing as they suggest brevirostris is finished, but most of the woodland (mixed, mainly deciduous) is fringed either by bramble or bracken. I'll get a specimen anyway though
Edit: and lots of yellow wasps, as you'd expect around Ivy. Several Chorisops racing around on leaves, and oddly, today a Lispe, at a height of 4 feet in thick bracken (usually a mud species)
Edit 2: in fact, all of the images of Lispe I've seen are on mud, I've never seen a photo of one in bracken (till now)
Thanks for the details of habitat...interesting. Worth getting one to put through a key properly.
the fly on the right has been posted separately
and is compared with a signatus.
The first image could possibly be signatus but the patch of dark on the hind femur is very small in my relatively slight experience of that species, and it has a mystery yellow stripe across the brow
apparently the black face-stripe character on brevirostris occurs only here in Britain, not on continental flies. And some British males which appear to be brevirostris from the genitalia don't have the stripe, so it's uncertain whether or not it always occurs here
The thin yellow stripe across the brow does occur sometimes on either Leopoldius, this is the first one I've seen
Lat/Lng: 51.6586, -0.1455
OS grid ref: TQ283971