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Time to start again.............who is he ? what is he? who are his children? who is his wife?
his age according to his death cert is approx 1810....this making him approx 30 in 1841
What is the exact wording on the death cert as to the District/sub district, Parish etc
I can see no Frederick Lancashire's at all in 1841, I can see a couple of John's in London but not of the age you are looking for ie born 1810 ish.... I can see a John aged 30 in Ockbrook, Derbyshire but need to know more of him and his family!
Bryant