And another thing......

Be very careful paying on plastic abroad that you're not paying in GBP at a rate offered by the accepting bank. This is becoming more and more common, and more and more underhand. You're supposed to be offered a choice, but more often than not, you're presented with a total already converted to GBP, and asked to sign/or PIN. There will be a disclaimer at the end saying "I was offered a choice and chose to pay in GBP". The rate will be pants and you'll probably end up paying a foreign fee anyway. Also seen when taking money out of ATMs - I spotted this in Zurich!

Refuse to sign and ask for the transaction to be conducted in the local currency.