If yout wallet is lost whilst you arre on holiday:
Cancel your card - the sooner you report your card lost/stolen the less chance you will be liable to any purchases made.
Report it to the police (even whilst abroad) and obtain a crime reference number for insurance purposes.
Card loss reporting numbers
Abbey National: 0845 -934 4900
Halifax: 08457-203-099
American Express: 01273-576-576
HSBC: 08456-007-010
Bank of Scotland: 0845-300-0344
Lloyds TSB: 0800-096-9779
Barclaycard: 01604-230-230
NatWest: 0870-600-0459
RBS Advanta: 0870 600 0459
Royal Bank of Scotland: 0870-600-0459