A fly apparently feeding on wild raspberries. I think it may be one of the Muscidae.
No interactions present.
It is Calliphoridae, possibly Calliphora vicina as the basicosta appears pale.
the long vein on the wing bends sharply forward as it nears the wing edge. In Muscidae, it's either straight or only bends gently forwards. Unfortunately a sharply bent vein doesn't get you straight to another family - Tachinidae and Calliphoridae both show this feature for example. However I agree with Mydaea that this is a blow fly (Calliphoridae).
"In Muscidae, it's either straight or only bends gently forwards."
Not so - Musca itself is an immediate exception, and Neomyia.
That identifying flies is a pain generally.....
Lat/Lng: 55.4737, -3.2026
OS grid ref: NT240206