Thank you both for your replies.
William 1, who was born in England, in Westfield in Sussex, the son of George & Ann.
His wife Harriet Golding Catt died 24/04/1852. William 1 was present at the death.
William 2 marries in Wellington on 12/04/1857. If this is the same William, these dates give a relatively small window for travel. I can't find him. You mention Australia, was this a slip or should I look at Aussie records too? The Aus/NZ reords are te one I am less sure about.
When William2 marries in Wellington, it is as William, not William Henry. He appears to acquire the Henry later, but he also records his father as William, the father of William 1 was George.
William 2 married Mary Ann Morris in Wellington. She arrived in NZ with her family on the 'Ann Wilson' which arrived in Wellington on 29/03/57. There is a story online that William2was on the same ship as Mary Ann, which makes sense as the wedding was just 6 weeks after this date, but the passenger records are online and I can't find him.
Also, there is an electoral record for William Catt in 1853-4 in Porira road, Wellington but this is a different area to Hutt.
Can either of you find his travel records??