Size of a bird is notoriously difficult to determine, even at the best of times - that is, with something in view to use for scale. (See some of the many Sharp-shinned/Cooper's Hawk debates).I took this in Mull yesterday, and a few minutes before a Raven flew past, this towered it in size, thats why i think its an eagle, seen common buzzards in the same area and this was a good 2 - 3 times the size.
I have emailed it to a couple of freinds on Mull who regularly see White Tailed Sea Eagles, and they think it could be one of those.