Hi Royd - Did you ever get a reply on this? Thomas Clarke West is a distant twig on my tree, so I have some details on him and family. His mother Martha was the 8th child of 11, of William West and Mary Simson. William and Mary were married on 15 Jul 1804 in Oxford.
William was the son of James West and Hannah Clarke. bap 10 Apr 1785 in Nuneham. James and Hannah were married on 6 Apr 1779 in Nuneham, witnesses John Pittsen and Sarah Shakespear.
I cannot find any baptism for James. At the same time (1770's) William and Elizabeth West were also having children in Nuneham, and a lot of the names match. It's possible William was a brother of James. Again I can find no trace of a baptism in the area for William.
James died in Nuneham and was buried 21 May 1822, aged 71, giving an approx dob of 1751. Let me know if you want any more details of siblings/wives.
Linda