Families with trips booked for later this year may find buying their holiday money now will give them the best deal, following a recent surge in the value of the pound. But experts warn that uncertainty surrounding the forthcoming General Election could spark further swings in the currency — for better or worse. Sterling service: Families with trips booked for later this year may find buying their holiday money now will give them the best deal, following a recent surge in the value of the poundSo when is the right time to buy your holiday money — and how should you do it? Laura Plunkett, head of travel money at the Post Office, advises travellers to carry both cash and a travel money card. Avoid airport hikeDon’t leave buying currency so late that you are forced to make the switch at the airport.