William Henry Cook - Cornwall UK

William Henry Cook married Mary Gilbert Gregory. Their marriage was solemnized at the Wesleyan Chapel in the District of Redruth in the County of Cornwall on 31st January 1863, his age was given as 20 years.According to their marriage certificate Williams father John was deceased. We know about the Gregory family, but are having problems find out where William Henry was born and all his ascendants. At the time of their marriage William and Mary were both living at Treeve Lane Gwithiam Cornwall. They migrated to Australia on 30th September 1865 aboard the "Gosforth". Arriving at Adelaide SA. Any one have any info? Thanks