He was baptized 24 feb 1766 Colsterworth and it was very likely he who was buried Feb 1st 1787 - also in Colsterworth. There is no record that he married. His Grandfather was James as well - he died about 1748 - there is a will for him so he did not live to 1787 to get confounded with his grandson.
I have been through the PR.
His father was Thomas Tinkler and mother was Elizabeth Oakley(I come through his son Thomas, brother to James)
Email me and I have a fair amount of information, for Colsterworth and surrounds, thanks to the Brown book mentioned by Mary ealrier.