Behemoth, the Sea Monster
Triumph twin - not sure of the model but the light coloured paint suggest it was quite new in 1959 - maybe one of the first Bonnevilles??. Agree with Bonneville about 1959.
A Bonneville with an Avon handlebar fairing? Yeah, right. Surprised at the usually reliable nzc - looks almost more like a Tiger Cub.
Triumph 1950 on - probably a Speed Twin because it is a dark colour.