The background to this question is not entirely clear, since Edinburgh already has 24 hour radar coverage. In the past, NATS rostered two air traffic controllers at night to provide the ATC service at Edinburgh Airport. In order to allow the controllers to take their breaks a Notice to Airmen would be issued setting out the times when the radar service was not available. With increasing levels of traffic NATS decided that it wished to increase the number of controllers rostered to three to provide cover for breaks and hence provide a continuous radar service. Following discussions with the airport owners and the airline users of Edinburgh Airport this was agreed. NATS has provided a 24 hour radar service at Edinburgh for approximately the last two years.