As a regular commuter to the capital, I know first hand just how unfortunate delays on the tube can be. It takes me around 2 hours to get into London, regardless of whether I drive or hop on the train and get myself directly into Paddington. These days I tend to opt to drive to Uxbridge and then get the Metropolitan line directly into Bakers Street. On a good day, this has proven to be the most efficient way, but add a delay to the equation and you have a recipe for disaster!
Commuting to London is a perk of the job that I have to say I really love, but there are days where I dread it. GoToMeeting have put together a really interesting info-graphic that shows you just how much time you are wasting on the tube...And it is pretty daunting to think of how much time goes by down there!