Heathrow airport had its busiest start to the year since before the coronavirus pandemic lockdowns in 2020 as travel restrictions continued to ease, according to data published on Monday. More than 5.4 million passengers travelled through the UK’s and Europe’s busiest airport in January, double the 2.6 million from 2022, Heathrow said in a statement to the London Stock Exchange. In January 2020 the airport had recorded its best ever start to the year, with 6.1 million passengers, despite early signs that the virus was spreading rapidly from China, where…