I don't normally praise The Sun out of habit,but they have come up with a classic story... http://www.thesun.co.uk/article/0,,2-2007000415,00.html

Something that we've known for a long time but that London's Tube system is the world's most expensive train journey.

It's not, as hackette Caroline Iggulden found out, a luxury excursion on the Orient Express, but rather a 43-second jaunt on the Piccadilly Line between Covent Garden and Leicester Square: 43 seconds covering 0.26km for a whopping £4.

That's 1.5 pence per metre, as the paper helpfully points out, easily topping the next most expensive short hop on the Tokyo Metro which comes in at £1.51. In New York, in contrast, "a subway ride costs £1.07, and in Rome just 67 pence and allows unlimited rides on tubes and buses for 75 minutes".