Stripy fly,large feet and red eyes.Lays eggs in dead meat.About 10mm.
No interactions present.
That's a good photo, you've done well to get so close to it, and I agree with your identification of Sarcophaga sp. - to sort out exactly which species in the genus would probably require microscope work!
Entomologist and biological recorder
Lat/Lng: 53.465066866632, -2.2487149536937
OS grid ref: SJ835965