Airport parking firms have been caught speeding in customers’ cars and stealing money from inside the vehicles.An investigation by Which?, the consumer watchdog, has uncovered cases of rogue firms driving cars over the speed limit and committing petty theft.Heathrow Police has received more than 300 allegations in the past two years of criminal behaviour from “meet-and-greet” parking at airports, including the wholesale theft of cars.Meet-and-greet services, also known as valet parking, park customers’ cars at an airport, or another secure location, and then hand back the vehicle to the customers when they return.Using GPS trackers, Which? exposed how Quick Park, an off-site meet-and-greet service at Heathrow, raced a client’s car down the A4 at nearly 70mph in a 50mph zone and left the vehicle in the back garden of an abandoned rectory, five miles from the airport.Quick Park’s website promises customers parking in a patrolled location complete with CCTV and Park Mark accreditation, wh...