I've just seen a very pale buzzard drifting across from W to E in wide circles with the occasional burst of flapping to maintain height.
So pale that my first thought was "that's a funny shaped gull.".
On a different note, one of a pair of Collared Doves has been attacking Woodpigeons in the garden. Despite being nearly twice its size, Woodpigeons flee in terror before it! Occasionally both doves attack together. They're not defending a nest; they spend quite a lot of time beneath a sunflower heart feeder to eat dropped scraps, long enough for any eggs to freeze, so I guess it's mainly defence of a food source, although they'll go out of their way to chase a woodie they feel needs a lesson!
Edit: Both doves present just now, one breathing heavily after pursuing a woodie to 3 gardens away. They're quite happy to share with a female Blackbird!