Unfortunate that this is a carcas. Found on farmland near the river. The only other evidence nearby were black/dark feathers.
No interactions present.
This is the remains of a bird of prey (perhaps a male Sparrowhawk or Hobby, based on the description of dark feathers and what looks like a few orange feathers on the 'thighs'), and the type of remains left strongly suggest that it has been eaten by another raptor.
I think this is probably a Buzzard. I'm certain it is not a Sparrowhawk (or Goshawk) as Accipiters have long thin toes - particularly the middle one. The size of the talons and the width of the tarsus are probably too large/strong for a Falcon, which tend to be more slender (I've never ringed a Hobby, but have ringed a wide range of others including many Buzzards). The orangy brown feathers in the thighs would also fit some Buzzards.
I did think that the feet looked a bit 'chunky' but decided that one of the smaller raptor species was more likely to have been eaten by another.
Now you've mentioned it, Accipiters do have pretty long toes - and a Buzzard would fit what we can see.
Perhaps eaten as carrion rather than predated?
I will go down to the field again in the morning and see if there is any more evidence. If feathers etc are still around I will take more photos. Many thanks.
Lat/Lng: 50.7, -4.2
OS grid ref: SX5191