Hi Adi, these are just terrific

The Swiss entry reminds me of an anomaly that existed until very recently on the French IGN series, generally taken as the OS equivalent.
Swiss mapping contour intervals are double the height of that on the French maps, 20m and 10m respectively. In true French ‘vive le difference’ at border areas between Switzerland and France the French used different contour intervals for both sides of the Border.
I was ski-mountaineering, with my good friend Stu Johnstone, in France, crossing occasionally onto Swiss territory: the slopes seemed terrifyingly steep compared to the map, what a bonkers idea!
If it’s OK with you, I will ask Steve Web-guru to put these links on the Resources page for every visitor to access.
Good job!