So if you are planning to take money out at the airport - whether it is a UK or international airport - head over to the ATM and walk straight past the bureau de change counter.

BBC: Travel money: When is the best time to buy?

But do offer them a choice of whether they want you to coach them about best strategy (making it likely they will win) or whether you want to play straight up, in which case your greater experience is likely to prevail.

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