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I have been searching for quality elevation data for the entire Scotland but I have not succeeded yet.

Do you know where to get the data in Raster or Vector formats?

Accuracy is very important as I intend to compare with other data.

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If you are in academia then the obvious place to go would be edina and digimap.

If you are not, then have a look here for free elevation data. Of cause you could go to OS the national mapping agency of the UK and get a 50m terrain model.

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Free of charge i would say:
Get either ASTER or SRTM from earthexplorer.
Both are available at 1 arc-sec., respectively ~20m vertical rmse.

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