NATS Heathrow air traffic controller in control tower at Heathrow airport, London. Controlling aviation traffic on the ground and in the controlled airspace around London, the NATS controllers help safely guide up to 6,000 flights a day from the top of the 87 metre high tower, handling 1,350 aircraft movements a day into Heathrow. From the chapter entitled 'Up in the Air' and from the book 'Risk Wise: Nine Everyday Adventures' by Polly Morland (Allianz, The School of Life, Profile Books, 2015).