I seem to recall in the distant past about someone getting prosecuted over this, Maybe as you say Horatio an Urban Myth..
Possibly an odd one here: It came up the other day when I took my shoes off while driving (they were hurting) and the wife told me I was breaking the law.
I've heard this from a few sources - that it's illegal to drive in the UK without shoes. Google turns up a couple of results, but when you actually search for 'barefoot' in the text, it aint' there. I've never noticed it mentioned in The Highway Code, let alone ever heard of anyone being prosecuted for it.
I'm starting to wonder if it's pure urban legend. Does anyone know if this 'law' has any basis in fact?