GB ET Potential Dataset for United Kingdom

In this post I am presenting another R exercise. Not that I believe very much on the physical content of the what Scottischsnow does here. (Actually this bold way of treating data and empirical formulas at large scale time and spatial is something that  I usually blame).
However the information gathered in this way could be useful as a reference step for doing physically based things, at a more detailed scale (for instance by using our JGrass-NewAGE).

Moreover I like it because it uses R all the way for extracting the data and visualising them, and this can be equally likely instructive.