Hi Denis,
My wife and I actually live in Germany and not Wiltshire, but you've picked a nice part of the country to live. As for a support group, my wife and I are members of a group here. They keep up to date with all the advances in science and everyone who attends the monthly meeting gives a run down on their condition and treatment so far. There is always someone who has been through it before. They organise activities such as walking – we live on the edge of national park forest – not the Black Forest. This gives all exercise and a sense of support.
What it doesn't do is help with government admin, e.g, what financial support is available, who local contacts are if we need help, dealing with government bodies such as the German equivalent of DWP, NHS, DLA etc.
Hope that gives a few pointers on what could be useful.
Richard