Transport Secretary Heidi Alexander ordered NATS chief Martin Rolfe to report back on the 'completely unacceptable' situation at a meeting this morning.

Martin Rolfe is facing calls to resign as flight cancellations and delays affect hundreds of thousands of holidaymakers across the UK

Around 1,300 flights were cancelled to and from UK airports on Tuesday after a technical issue hit NATS, which provides air traffic control services to 15 airports across the…