Good old BBC putting the licence payers money to good use. Black cab Vs. Sat-Nav For any one who has not used a black cab in London, the drivers are well known for their 'knowledge' of London. Just to get a licence takes 2-3 years of learning the roads of London. Oh, and the reason for the sarcastic comment at the top of this post, I've just bought a Tom Tom GO 720 and it got beat by some bloke called Andy in his cab. Guess now there will be a flood of post about how a Sat-Nav system sent you the wrong way down a one way street or through a 15ft deep river.