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The context you describe could well apply to a Rook colony. Carrion Crows are pretty territorial at their nest sites and probably would not tolerate other pairs nearby.
Your statement "flocks of carrion crows" does make it sound like there might be a rookery here. Crows will flock if there is a particular abundance of food in a location but generally they will chase off a third bird. Rooks always go round in flocks.
The 2 are not that easy to separate at a distance but if you can get close to one look for the long, pointed, light grey bill of a rook as opposed to the shorter, black bill of a crow.
Lat/Lng: 52.0, -1.5
OS grid ref: SP3937