 He was then successful in winning the seat of Onehunga in a after the death of Arthur Osborne, and held it to 1975.Watt was first appointed as a minister in the Second Labour Government led by Walter Nash; he was both Minister of Works from 1957 to 1960 and additionally was Minister of Electricity from 1958 until 1960.As Minister of Works he quickly became known for both his vitality and genial style of inspecting infrastructure sites.