What kind of bird is this?

Saw this guy perched on top of my garden gate this morning as I left for work. I can't quite convincingly identify what type of bird they are although I know very little about birdspotting. They were remarkably calm and unflinching, they sat right there on top of my gate even as I opened the gate from underneath and walked though, just continued to watch me without showing any alarm. The closest match I could find would be like some form of feral pigeon, but the beak and eyes appear dramatically different to any example I can find. Any clues as to what bird this is?

Thanks