 Complete the following phrase:  The 1974 New Zealand Grand Prix was a race held at the Wigram Airfield Circuit on 19 January 1974. The race had 20 starters. This was the first and only New Zealand Grand Prix to be held at the Wigram Airfield Circuit, and the race was also the 1974 Lady Wigram Trophy. The race was moved to Wigram from the usual Pukekohe to be part of the 