Uber drivers mounted protests at Heathrow Airport and Trafalgar Square as part of a 24-hour global strike over pay and conditions.Thousands of private hire drivers, including those working for Bolt and Addison Lee across the UK, logged off from 7am on Thursday to protest against the “gig economy”.More than 50 private hire drivers met outside Heathrow Airport from 7am – 9am, said to be one of Uber’s most lucrative spots in Europe.