Probably like a lot of people here, I've been entertaining the idea of the doing the Great Divide Mountain Bike Route (or even the Tour Divide)

But in thinking about it (a lot) I wondered if someone has done the same thing in the UK? It appears from this map https://upload.wikimedia.org/wikipedia/ ... heiden.png that the UK geographic watershed runs from NE Scotland to the SE coast of England. That means, with a little jiggery-pokery, and perhaps a slightly fluid use of the term "following the watershed" it could incorporate bits of the Highland 550, the Pennine Bridleway, the Cotswolds, the South Downs Way and probably a bunch of other stuff I don't know the first thing about.
I'm guessing this isn't an original idea. So does anyone have any experience of it?
Cheers! Tom