The more I look at this photo the more I think it is a mock up. The chimney I mentioned is directly above the T wood plantation on the Pentlands.
I still like the photo even if it is a compendium. It reminds me of a photo in The Scotman that should an RAF fighter over Edinburgh Airport that could only have been
taken from another fighter along side it. The newspaper admitted they had been had.
If you go to Pettycur Bay on Google streetview and look across, the angles & proportions seem right for the stadium & Arthur's seat. I don't know about the pentlands, but it's definitely doable with the right weather, lens & exposure.
The chimney/mast thing is a puzzle, but if it was a montage the person that did it is too good to make that mistake IMO.