This technology is already used to some degree when you go through automated passport control, and has already been tested at Heathrow over the summer. It is now ready for a wider roll out and should be in wider use by summer 2019.

The eventual plan for Heathrow, according to program manager Simon Wicox, is to make the airport so efficient that you won't have to break your stride as you move from the entrance all the way to the plane. We're all looking forward to that, Mr Wilcox.