It looks like a very large raven but has the feathered/furred legs and curved talons of a raptor. The whole body is dark. I haven’t had a good sight of the beak except that it too is dark - or rather, I did not see any flash of colour. It was perched in a tree quite close by - perhaps as close as 100 feet - but the branches were preventing me from getting a clear view. Location is NE Scotland.
While it was there, other birds were conspicuously absent; now it’s gone, a variety of birds have flown past.
I expect it was an exceptionally large raven with overdeveloped legs (to compensate for the size), but could it be something else? It did look very much like a black eagle, except that has a yellow beak and is normally in India.