5) Ask your bank for an extra client card. If the first is taken, you still have the second one to withdraw cash with

If you take cash be sure that the bills are crisp and new. My experience in developing nations is that currency exchangers don't accept old, torn or folded U.S. dollars. Perhaps the same is true for the British Pound and the Euro. Exchanging at a bank is an option, but problematic on weekends and bank holidays.

Chase does not replace credit or bank cards internationally.

In Belgium it is really easy: you call a special number and done, your "kredietkaart" is blocked.