On 4 April 2013, during a brief daytime runway closure for inspection purposes, a vehicle entered the runway without ATC awareness and was still there when the runway was re-opened and the first landing clearance was issued. TWR control subsequently observed the vehicle on the runway visually but, when they were unable to make contact with it, instructed the aircraft on final approach to go around when it was just under 1nm from touchdown. It was discovered that the vehicle involved had been in broken contact with another nearby aerodrome because the wrong radio frequency had been selected.