Son of Mr Spotty probably, though this one has no white feathers at all - in fact none of the current crop of blackies have any.
I think this one is now in full adult plumage as I'm not currently seeing any that look like juveniles.
One of them made a very brief visit to my window feeder the other day, I didn't dare move in case I scared it off LOL. Hopefully he'll be back.
TTTW