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Having looked at it on a big screen I'm now in two minds, lets see what others think. I think the second bird up is a Rook and possibly the top bird, the other two I cannot decide on.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
I agree their heads look like rooks, though they seem to be much larger than some rooks I see. Must have missed the buzzzard!
All have the slender bill and peaked crown of rooks. The lowest might be a young bird - it appears not to be in wing-moult like the others and the bill base looks dark, but structurally looks OK for Rook too.
Flickr pics: http://www.flickr.com/photos/72243477@N00/
Lat/Lng: 51.1001, -1.7356
OS grid ref: SU186334