I don't know what I saw in Aviemore!

Hello everyone, 

Complete newbie here so apologies if a silly question... I've just come back from a lovely few days in Aviemore. Whilst in the Cragellachie Nature Reserve I saw a huge shadow in the trees a long way off and took the best photos I could although this bird was a long way away with the sun behind it so at the time just looked like a shadow! 

These are the best pictures I have (and they are not good!) but because the colours/lighting are all off, I can't get a match on the bird ID section of the website so thought I'd ask! 

I know the area is quite famous for buzzards, and I have never seen one of those, but thought this was very big and not sure how big buzzards get? 

Any info would be most gratefully received.

Thanks,

Elaine