Deep orange and black stiletto fly that I havn't seen here before.
No interactions present.
If you want to add the ID again, there is no letter 'i' in Thereva. The species name nobilitata does not need a capital letter.
nobilitata is probably correct, as it's far and away the commonest species. Strictly, the features for a specific ID, like the frons spots, cannot be seen, though.
My Flickr photos...
Thanks Ophrys, correction made.
Lat/Lng: 50.721161, -1.847763
OS grid ref: SZ108912