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@Chris Wilson
Though my guess would be a Goshawk and failing that some harrier perhaps.
Edit 1:
In fact I'm sticking with Goshawk. Sparrowhawks are tiny
A large hawk, almost reaching buzzard size. When seen close to it has a fierce expression with bright red eyes and a distinctive white eyebrow. Find out more
www.rspb.org.uk
edit 2:
Now I'm not so sure. Watched the video a few times and it looks to be a similar size to the prey item which would suggest I was wrong and
@Whitewater was bang on the money. Though looking at pictures of a Goshawk and Sparrow Hawk's tail feathers, they have similar markings. But I would expect a Goshawk to have a significant size advantage over a pigeon.