For over two decades Gareth Scourfield has been telling Britain’s men how to dress – first at British GQand Esquire, then on the red carpet, with celebrity clients from Daniel Craig to Richard Madden. Here, the fashion veteran – whose work has taken him across the globe and back again – imparts his pearls of travel wisdom, from the three things you will always find in his suitcase (clue: once a stylist, always a stylist) to how to avoid a holiday hangover.