365:141 Unidentified caller

Snapped through the (sorry about this) mucky glass of my bedroom window. I thought it may be a Chaffinch but now that I see the photo, it looks not a lot like the RSPB says a Chaffinch should look. Perhaps it's a Juvenile.

Anyway: 141 is The telephone dialing prefix for withholding one’s Caller ID in the United Kingdom