there was an electrical fault on the approach lighting system (the main junction boxes/controls of which are in the tower building)which led to a smell of burning and a precautionary evacuation of atc. the airfield lighting had to be notamed as unserviceable until the fault was checked, hence the airfield efectively being closed for about 45mins from about five o clock.
no passenger flights were effected,any subsequent diversions/cancellations were due to the fact that when the airport re-opened the visibility had dropped to about 300m