A few things that looked like this about.
No interactions present.
I’ve had a quick check of Diptera.info (Tephritidae) and this looks OK. It seems that the thorax of the female changes from black in spring to red later in the year. This may well be true of the male but I’m not sure.
Lat/Lng: 51.546762058095, -0.33246517181396
OS grid ref: TQ157844