Depends where you are travelling if using the Nationwide Flex Account debit card. In Europe there are no fees but if going further afield like US, Asia and Oz/NZ then they charge the basic handling fee passed on by Visa which is 1% for eityher purchases or withdrawals. A list of countries is available by going to the site page below. A Nationwide Cash Card (basic bank account) does not carry a charge at ATM's but canot be used at restaurants and other retailers, the Flex account debit card is much better and I use mine extensively through different continents.
http://www.nationwide.co.uk/current_account/foreigntransactions.htm
There are some credit cards which still have a 0% charge for purchases but they whack you for cash withdrawals.