I have no idea what kind of bird this is. Richard and Christiane would know. He has been inhabiting the window sill over the kitchen sink for the past couple days. Don't know why. Maybe there are some ants for him to eat or something like that.
A Sparrow, they lived everywhere in London, just about the most common bird.
Then a few years ago they all disappeared.
All the "Experts" are still arguing why.