Hi Ellen , according to the Mariners and Ships list there were three "Kestrels" at that time , a 495 tonner that sailed from the UK and US to Melbourne and Sydney , a 191 ton from Auckland to Sydney 1854 , and a 170 ton that seemed to sail from Fremantle to Sydney and Adelaide to Sydney. If William ended up in Warrnambool it is possible that the Kestrel might have called in at Port Fairy , which was a busy port then. These records could be in Melbourne, not in NSW Archives. I could only find the first arrival of the "Star of England" in 1889 ??? There are a couple of Family Trees for William on the Internet , just google his full name , one is on Mundia , the other is a private one by a Robert MacKinnon of Kelvin Grove, Qld. One indicates he changed his name to.............West !!