Flights in southern England have suffered delays because of air traffic control computer problems. Nats, the national air traffic control body, said UK airspace was not shut, nor were all flights in and out of the UK suspended - as one airport had said. Nats said operations were returning to normal following technical work carried out at its Swanwick, Southampton, control center. Contingency plans had been put in place to minimise disruption, it added. Nats provides air traffic navigation services to aircraft flying through UK controlled airspace and at several UK and international airports. Its website said it handled 7,086 flights on Monday.