On BCC Sedge has Thomas Darby born 1788 married to Lucy Nock and 4 children.
I have access to a private tree on Ancestry which shows another son Thomas Darby born 1812 RR who married a Catherine Shipton born 1814 but not other children shown in 1841 Census. Thomas and Catherine were shown as married on 1841 Census.
The private tree goes back to 1500 on Nock line and I have Details connecting Thomas b. 1812 to Bennett family and Lench family who were two families responsible for starting the Lench nut and Bolt factory in Blackheath.
However I wonder if anyone can validate link between Thomas 1788 and Thomas 1812