I have his marriage certificate and all the kids birth certificates. He did not jump ship but was noted on the St. James passenger list besides Sarah Wilsher’s entry as marrying her. He lists his parents on the marriage certificate as Michael Bradbury, sailor and Bridget Murphy. I am unable to find any information about him before he arrived in Australia. I have searched English records for births, marriage of parents, census records, etc. - all the usual places I can think of. It is possible he was born overseas if his father was a sailor and I have searched what records I can for overseas births. I have a Trove account of a court case he was involved in from Australia where he states he is a British
Lion.