Going back Soil Hill Dec 2011 DJS told me of a very dark Snow Bunting on Soil Hill and on the day after I found the bird and got the above photo.
The bird was dismissed as just a dark phase but looking back now through photos and using the I.D. info from the links provided by Ian Hargreaves I,m sure that this was of the race insulae, Iceland, as opposed to the nominate race nivalis, Greenland, Scandinavia.
It was an interesting bird and I should have gone into it at the time but things tend to let slip and then forgotten.
BS