Just for the sake of paranoia, I hope, I'm interested in hearing from Americans traveling in the UK whose bank cards did not work when trying to get cash from ATM machines. I haven't had problems in the past (in my case, a Bank of America card) but a New York Times article this week points out that an increasing number of ATM machines only accept chip & pin cards.
If worse comes to worse, can you use the card inside the bank to withdraw funds?