I've updated my visted countries maps, and they look like this (with Germany and Austria being only fleeting):
I've visited the counties in yellow.
Which counties have you visited?
made by marnanel
map reproduced from Ordnance Survey map data
by permission of the Ordnance Survey.
© Crown copyright 2001.
On the UK map, much is to be taken with a pinch of salt, it's very easy to go between UK counties! I've only been to Scotland once, and that was fleeting. I've been to most counties in Wales (if not all), but am making best guess, and I really can't recall the southwest of Wales, the rest is on a 'best guess' basis. The nearer to London, the more sure I can be of the counties actually visited. I tried to tick only for actually setting for in the counties, rather than setting wheel - so I can't be sure of Rutland, and can't recall going to Norfolk at all (though I think I was taken to the Broads once, I have no memory of it).