I've been up there. If there's 1000 tons of concrete under each tower I don't know where they're hiding it. (The mass of foundations needed will vary enormously depending on what you're building it on - solid rock needs very little).
Comparisons between the resource usage of nuclear and wind construction are deliberately twisted by the nuclear spin doctors. Steel used in a nuclear plant is mostly not reclaimable; a wind generator doesn't contaminate the tower it sits on and big steel tube is an asset. And you can easily replace wind generators part by part, reusing the foundations; the only bit of a nuclear boiler you can replace is the fuel rods and nobody has ever managed to dispose of the foundations of one.
Fala/Dun Law puts out 47MW. There are a lot of similar farms in Midlothian, East Lothian and the Borders; together they must be pretty close in output to that of Torness (which has not itself been that reliable lately, with its coolant supply interrupted by plagues of seaweed and jellyfish).
Nuclear power has to compensate for variations in load as well - pumped storage was invented precisely for that purpose. You can't up the output of a nuclear generator to match what happens at the end of a popular TV programme. The point about renewable sources is that they don't all fluctuate in sync; have enough different types and enough pumped storage and you can get a steady enough supply.