I'm going to stick my neck out here, rock dove, based on the double bars on the wings.
But, brace yourself, I'm often wrong, so hopefully someone will give us the right answer.
Mike
Flickr: Peak Rambler
What you've got to remember is that Rock Doves are the ancestors of all domestic Pigeons as explained HERE. They are the same species, that is Columba livia. It's debatable whether there are any true wild Rock Doves left in the UK. Maybe on some remote western isles in Scotland.
In the case of your two pigeons they have retained the plumage of their wild ancestors but they are clearly feral because the are ringed. I suspect they have gone AWOL from some pigeon fancier's collection.
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Tony
My Flickr Photostream
Unknown said:
I hadn't seen the leg rings in my original response, the image was on a small screen and not clear when zoomed in, so I'm changing to feral.