Craig Charles and the team celebrate the 400th edition of the technology programme, with Georgie Barrat building a birthday cake out of smartphones and 3D-printed buttercream. Jon Bentley heads to Paris to put the latest sat-nav devices through their... (more) paces, while Ortis Deley compares tech available when the show began in 2004 with the Apple iPhone 11. For the grand finale, the presenters embark on a mission to reclaim a world record they once held - for the longest jump by a remote-controlled car.