I don't normally do this, but I just found myself watching Top Gear.
It was pretty cool, though. They arranged a race from Kew Bridge to the London City Airport. Richard Hammond cycled, James May drove a 4x4, The Stig took public transport (bus, underground, and light railway), Jeremy Clarkson took a power boat down the Thames.
The boat was restricted to 9mph for part of the journey, but finished the journey at 70mph - there's no speed limit below Wandsworth Bridge. Nevertheless, Richard Hammond won the race on his bike, and the car came dead last!
You can watch it on BBC iPlayer http://www.bbc.co.uk/iplayer/ Search for "top gear", the race starts about 40 minutes into episode 5.