As politicians and businesses wrestle with potential changes to U.K. border controls, one of the world’s largest online travel booking companies has decided to double its headcount in London, and it’s not alone in looking to expand. Expedia Inc. will expand its U.K. office by 138,000 square feet, or to roughly twice the size of its existing space, and has signed a new lease that runs until 2030, according to a company statement.