cloud69 I think Scroggs may have been referring to London Black Cabbies, who do earn good money depending on how many hours they decide to put in.
I have heard estimates between 30K to 90K a year....it all depends on how much you work. However you have to work hard to make the big bucks. They do say 'There's no such thing as a poor London Cabbie' but I'm not sure how true that is.
Still with the IT and Finance industries shagged it could be a new way of funding your ATPL! Hard to pass the 'knowledge' exams though, only a 30% pass rate and some people take years riding around London on a moped to learn the routes.