Martin Lewis has issued a stark warning to anyone who has already snapped up a holiday for this summer. In a fresh update, the personal finance expert has urged those who have already paid for breaks with major holiday companies and airlines, including TUI, Jet2, Ryanair, Wizz, easyJet and British Airways, to take note. Appearing on his ITV show, he warned that failing to take one crucial step after booking could leave holidaymakers with absolutely nothing if their plans go awry. With the