Technical issue at Nats resolved but flights to and from UK airports still disrupted; oil prices hit $100 a barrel for first time since July and gas prices also jump

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

A technical issue in the U.K. air traffic control system has led to the cancellation of nearly 300 flights, according to Flightradar24