Heathrow airport expansion backed in poll UK holidaymakers and global tourist chiefs believe expanding Heathrow is the best way of solving Britain's airport capacity problems, according to a survey. But while a third runway at Heathrow was the most popular choice, the "Boris island" Thames Estuary airport plan favoured by London Mayor Boris Johnson also received backing. As many as 28% of holidaymakers plumped for Heathrow expansion while 25% backed the estuary plan in a survey by the organisers of the World Travel Market (WTM) which opens in London tomorrow. Around 21% were in favour of expanding other airports such as Stansted, Gatwick and Luton. Of 1,300 world tourist chiefs surveyed, 34% opted for expansion at Heathrow, with 20% backing the estuary airport scheme. The survey results come as former Financial Services Authority chief Sir Howard Davies begins his Government-commissioned work into the UK's airport needs, with his full report due in summer 2015. WTM director Simon Press said: "It is clear that senior travel executives from around the globe are in favour of expanding the UK's primary airport with a third runway at Heathrow. Expanding other airports in south-east England is more popular than building a new airport which suggests that our overseas colleagues think the UK Government should steer clear from an ambitious if expensive solution when there are better options available.