Chris Trotter: Bob Semple's Tank.

“BIG BOB” stood tall at 3.6 metres, but that was the full extent of its impressiveness. In virtually every other respect “Big Bob” inspired little more than mirth. The man who commissioned “Big Bob”, New Zealand’s first home-made tank, was Public Works Minister Bob Semple. Never overly fond of being laughed at, he is said to have snarled at his critics: “I don’t see anyone else coming up with any better ideas!”

The irrepressible Semple, one of the most colourful members of the First Labour Government, had a point. At the outbreak of World War II, in September 1939, New Zealand had precisely zero armoured fighting vehicles.