The UK is undergoing a programme of ATM upgrades to accept chip based (i.e. smart card) debit & credit cards. I know that Europay/Mastercard/VISA will be supported & also think the Amex cards should be OK, but don't know about Diner's, JCB, etc.

The ATM will still read the foreign traditional magnetic stripe card for a period so everyone's card should still work normally.

Bob vG