Those wanting to help airports make even more money out of them can opt to buy their currency at airport kiosks just before they fly, rather than shopping around for it in the days before they go.

A recent article in The Daily Telegraph showed that those using airport kiosks could get around £9 worth of euros or dollars more on every £100 exchanged if they instead used specialist outlets or online traders, or £90 on £1000. Almost as good were retailers like Marks and Spencer, and even some banks.

Airport managements take a kick-back percentage from all companies trading from within their premises, as do railway operators.

Travellers are also advised that better rates still can be often be obtained at the destination, especially when sterling is strengthening. And that it is worth buying half the currency needed when booking the trip and the other half closer to travel date, to even out any peaks or troughs.