http://www.skechers.co.uk/WOMEN#Color=Black
If you're after comfortable shoes for walking / driving, I'd be tempted to go for trainers of some kind. Sketchers do a pull on variety.
They're not "smart" (well, not in an office-smart kind of way) and aren't trying to be, unlike some of the earlier suggestions. If you're worried about style, then it's kind of obvious you're wearing a comfy shoe for walking if you bought something like these, rather than trying to find "stylish walking shoe" 