Thank you both for this, really useful information and given my plenty to look at. I don't live very far from Richmond so think a visit to the churchyard is in order!
I had found the marriage of Thomas Redford and Mary Cowling but had assumed it was a son born in 1792, (this Thomas was transported in 1814 for 7 years)
I wonder if Thomas senior was born in abt 1754 if he had been married prior to his marriage to Ann Hopper so will also look at that.
Just goes to show you should never rely on other people's family trees

I don't usually but was getting so frustrated with this family I did have a look at what was on Ancestry, although I should have known better as so many other facts are wrong.
Really appreciate your help