Hi John it is a Blackbird, try googling leucistic Blackbird, or Partially leucistic Blackbird.
How unusual to see two similar leucistic BB's John! Wonder if the similar other one was a juvenile? Hope they come back for more pics!
Thanks Alan, wow! A Blackbird that isn't black (or mottled brown for the femaless) - hadn't appreciated that a leucistic Blackbird existed. So looks as if my sightings must have been a females.
Thanks Wendy, yes very unusual. Never seen anything like this before. So will keep a lookout and try to get better photos. As the two were quite similar I wondered whether they could have been from the same brood? Amazing what can turn up in your garden!
The Blackbird in the photo is a juvenile, and could be either male or female.