I think this is a raven, spotted to the east of Marazion.
No interactions present.
Hard to judge from a single photo with no sense of size, but the look of the head suggests Raven to me. (mind you I'm from Norfolk and hence hardly familiar with them)
This looks to me to be a juvenile Raven. The bill looks very heavy, but without anything to compare it with the size of this bird is unknown.
The shape of the bill is wrong for carrion crow. This would be more obvious if the bird was in profile, rather than looking partly towards the camera.
Lat/Lng: 50.0, -5.5
OS grid ref: SW5427