Hi Norm, UK cards are chip and pin.
[Editor's comment: Some European countries are beginning to introduce credit and debit cards with embedded "smart chips." You may see signs or keypads referring to this new technology. You may encounter a few merchants in Europe (and especially the UK) who no longer have hardware that can read magnetic strip US debit cards. Some supermarkets and gas stations have card-reading machines that will accept a debit card that has a smart chip embedded in it; there is no way for the clerk to override this.
There are still plenty of merchants that have the older magnetic strip equipment, and your US debit/ATM/check card will work fine. Global card networks like Visa, Mastercard & American Express require that merchants accept all cards, chip-and-pin or not. (That doesn’t mean that every cashier is aware that options still exists or knows how to do it.)
To avoid the hassle we recommend you withdraw all of your spending money with a debit card via ATM machines; it’s much easier and you can sometimes get discounts if you use cash instead of credit. Carry cash and change for parking and train stations so you don’t have to use your cards there.]