Illustrating the current madness being perpetuated on the civil register, the Blue Bus blog about Nelson 19 May 2008 held an image of AS 350 ZK-HYM of Milford Helicopters. Here it is again on the Cascade Creek airstrip on 14 February 2008. Except it's not! This is the replacement, c/n 3287, first registered 1 Mar 07, the day after the last one was cancelled. You are pretty hard pressed to see the difference between the two.
By the way, the C150C ZK-CCL parked up at Ardmore is c/n 15059742 ex ZK-CCK. Since ZK-CCK had since been reallocated, Arthur took the next one available in sequence. Simple really.