Hi Sue, I have just gone through all the Harts in Bolton in 1841 and have just got the message from Bob that the 1841 Census is on Ancestry. I have found your Harts in Yorkshire. Princes Street, Thoraby. Registration District Stockton Thomas Hart 50 Blacksmith Not born in County. None of the family are born in the county Margaret Hart 45 Michael 15 Blacksmiths App. Monica 4 William Robinson 20 Hammerman to Blacksmith Mary Robinson 20 Sarah Robinson 15 Robert Robinson 10 Margaret Robinson 9 Are Michael and your Thomas the same person? Kind regards, Anne in Bolton.