He surely is difficult to track down regarding his birth and death. Jane married Thomas Price, a butcher, and Thomas witnessed this in 1848 but he disappears from any 1851 census records. He married Sarah Gibbard on Christmas day 1806 ( the record has 23rd Dec but is wrong) at St Giles, Cripplegate. John is John James and there is an elder brother Thomas Gibbard Tizzard - they both died in the same quarter of 1864. I would like to get to the bottom of that mystery.
I am sure you probably know all this but if there is anything you can add, let me know.
Andrew