Great quiz, although tough for us North American types. Need one for this side of the pond, I guess. Can you accept Northern Harrier for Circus cyaneus? (That's the official AOU common name over here.)
Is there a reason Goshawk isn't counted? I've always assumed they were native to the UK and have seen them here - so not sure whether their omission was an oversight or whether they're actually an introduced species or something :)
Previous quiz: British birds #2 : Other water birds