Is it just a buzzard?

Was up in Glen Esk today, spotted this bird that I'm guessing is a buzzard but I'm not 100% sure so I thought I'd ask here just to double check.  Size was hard to judge, but it was at least as big as a buzzard but the wings look a bit long to me.  I spotted what I assume was the same bird a couple of times somtimes close to the ground and then higher in the sky.  Unfortunately none of the photos have any indication of underside colour on them due to the poor light and even through the binoculars I couldn't see any patterns to the underside.