No interactions present.
With pale antennae, it is probably scalare, but mellinum is very similar (especially the abdominal pattern). It is useful to see the frons to be sure (heavy dust spots in scalare, shiny in mellinum).
My Flickr photos...
Thanks. Couldn't quite say here if this hoverfly is still going for pollen [re my previous post: "Hoverfly manipulating an anther (Hogweed inflorescence)"].
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707