From the aerial configuration and the fact that you can just see the start of the "INST" serial number is is most probably either NZ1826 or NZ1828 which were two signals devons converted to instructional airframes at the end of their flying careers at the beginning of the 1980s
Wigram is located near Hornby in Christchurch. It was the original New Zealand Permanent Air Force Station when the government of the day took over the Canterbury Flying School in 1923. Named after Sir Henry Wigram who donated land for the airfield and was a strong supporter of military aviation in the early 1900s. Wigram remained the primary flight training base, and ground training base until flying was withdrawn in 1993 and the base officially closed in 1995. The land (with the exception of that retained for the Air Force Museum that was established their in 1987, was passed over the the Ngi Tahu corporation who over the next few years converted the airfield into residential housing.