Any Ideas on what kind of bird this is?

[mothhawk]

Why not send the link to a local bird watching group in the Sheffield area? They may ID it for you, or offer to come round and have a look, or maybe it's a bird they've spotted already.

[Pinfold Plotter]

Does it look like this?

It looks like it is doing that fussy thing with its wings that blackbirds do when they're agitated.

(I love puzzles like this!)

[TEB]

A leucistic Blackbird