strange bird on Exmoor

Peter French has sent me this amazing image in the hope that someone out there knows what it is!

The closest we could get was a red winged black bird……but is it a bit big????

Also, could they be tags, but unlikely on the leading edge of the wing?

We would love your comments, and especially if anyone else has seen/ photographed it, Peter saw it in the skies above Brendon Common, Exmoor, on September 7th.