In reply to ben b:
As well as trying to match the geography, you need to bear in mind they require a road or very good track for all the vehicles, hospitality trailers, generators, Lorries with loaders/cranes for bits of set, etc, etc you see during outdoor filming.
It's a bit like a travelling circus.
What you get onscreen will be patched together from scenery in the area, so big hills in the background might be nearby hills but not necessarily ones you expect from the "real" view. Got to be Cruachan area
Post edited at 09:46