Sorry, no picture but perhaps a description will work.  As we would pass farmers fields often a large "grayish" bird would be flying, heavy chested, dark band on tail underside, strong and rapid wing beat, likely pigeon sized or slightly larger.  We saw these birds singly, not in groups.
If the description rings a bell, please point me in the right direction of images to find the answer.

We also saw magpies, the version living in the UK which is slightly different from the western North American version of magpie.  This was the first time to see a magpie.  At least that one I figured out.   The pigeon like bird above fields is still unknown.     Thanks for any insight.  TomDart.