Posted: 06/07/2014 at 13:40
Definitely not a bullfinch - the nearest I've ever seen to your picture is a House finch from North Africa but the colour is too bright and the markings are too distinct for that.
I'm pretty good on UK birds but that's not a native species. I've looked on all the websites with finches from around the world and can't find it.
Can you notify the RSPB here http://www.rspb.org.uk/advice/watchingbirds/reporting.aspx