Unusual Sparrow on Tresco, Isles of Scilly...

I spotted this at the Abbey Gardens on Tresco and presumed it was my first Tree Sparrow due to the unusual colouring on the head/nape. However, after looking at many photographs of Tree Sparrows, the colouration just seems wrong, and the fact that Tree Sparrows are very scarce in the South-West adds to the mystery.

Unfortunately I was taking pictures with my 18mm wide-angle lens at the time, so it's not great quality when zoomed digitally.

Anyone any ideas?

Thanks,

Jamie.

Check out my Cheshire Wildlife blog and website at http://www.ourwood.org.uk