ritish families heading to the sun for two weeks this summer will face a depressing sight when they look at the currency tables. This time last year, £1 bought about €1.30 – almost 12 months after the Brexit vote that same pound buys just €1.15. For those who have not retreated and opted for a “staycation”, the annual break in continental Europe could now cost significantly more.So what are the best ways for holidaymakers to save money and avoid unnecessary expenses?ADVERTISINGTravelex to withdr…