This is a Waxwing (Bombycilla garrulus). What drew my attention to it was the fact that it was “putting manners” on the Blackbirds (Turdus merula). Not many of the garden birds can do that. In fact the Waxwings got together in a little group of two of three like a gang. Time for an ASBO perhaps.
For more wild bird sightings; below are some links to the Sussex Ornithological Society's website.