Sparrowhawk

 

The female Sparrowhawk has brown plumage, is larger than the male and eats larger prey (birds as large as pigeons). TV aerials make good look-out points.

The male Sparrowhawk has grey plumage on his head and back and eats mainly sparrow-/finch-sized birds. They swoop through gardens and woodland chasing prey, unlike kestrels which hover high and dive. Almost all prey is avian, unlike kestrels which take voles/mice.
This one also has eyes in the back of his head.