A grey conopid fly seen feeding on Field Scabious in the road verge. Is it a species of Thecophora?
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I think you are right, though I have never seen one. Assuming it is Thecophora, it would seem to key out as Thecophora atra, with hind femora only orange at the base and second antennal segment long.
There is also Zodion to consider, though.
My Flickr photos...
Following up on your suggestion I found some photos of Thecophora and Zodion on the internet. I think the markings on the abdomen and the shape of the proboscis more closely resemble Thecophora. Interesting flies - I've read that they latch onto bees to attach their eggs, though not found a photo of this.
Yes, I think that Thecophora atra is most likely. Conopids are great flies...striking appearance and interesting life histories. If you check out flowering thistles and ragwort, through July and August, you should find others, like the colourful Conops flavipes. The common conopid at the moment is Sicus ferrugineus, which is relatively easy to find in flowery areas at wood edges.
Lat/Lng: 50.6731, -1.1637
OS grid ref: SZ591862