If I remember right, you don't drive and never have? I know quite a few musicians don't, such as your erstwhile partner Martin Carthy, Ashley H doesn't either I think, Ian Anderson etc...
It obviously hasn't been too much of an issue.
Not that I put myself in such company, but I don't drive either, mainly because my mind is way too easily distracted and I think it's safest for everyone if I find other means of getting around.
I've just never felt the need for a license.
Is your reasoning similar?