Passengers at Heathrow can now leave leave laptops, tablets and liquids inside their cabin baggage where new scanners are operational Sign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Many airline passengers say the worst part of any journey is the airport security check.