Thanks Nick and Ros. You've both been very helpful. It's really good to take my Crossman ancestors back further. I can see a lot of research has been done, so I am very grateful to you both.
Ros, the point you make about the occupations is very interesting - I've just looked at Philip's marriage certificate from 1852 and his father's occupation is labourer, so as you say they were not craftsmen.
Hopefully I can help you out with Philip Oats Crossman, just let me know. He was my grandfather's grandfather but died twenty years before he was born.
Kind regards
Marc