London's public transportation is so punctual it's almost annoying. I remember missing the first coach to Heathrow Airport from Cambridge, scared me to death, was so afraid I was going to miss my flight because the 2nd coach was coming about an hour later. Heh, I was late by what, 2 minutes. And yes, I know I could have taken the trains to Heathrow but I had too many luggages and I was travelling alone.
