Jebber thanks I live on the west coast of the USA so a trip to Kew will have to wait a while.
Ken thanks for the information. My Thomas Sullivan was born in London on 10 Aug 1837. He was married on Aug 20 1881 in Salford, Lancashire and is shown as a bachelor. His parents are Robert Sullivan and Elizabeth Cook. I have him on the 1841, 1851, 1891, 1901, and 1911 census. But not on the 1861, 1871, and 1881 census. On the 1911 census and his death certificate he is shown as an Army Pensioner.
Shaun thanks, it certainly sounds like something worth looking into.