Hello Wren and Sharonie2,
I may be covering old ground for you, but just in case it helps, I think I know the connection between the Harwar families of London. As you know the story starts in Cheshire - Thomas Harwar and his wife Katherine had a large family (nearly) all of them baptised at St Peters, Congleton. Thomas dies (unexpectedly?) on the 4th July 1795 without leaving a Will, and letters of Administration are granted (see original documents on Find My Past, quite a complex procedure by the look of it). Most if not all of the children are listed including Richard and Henry!!. Now Henry's baptism is not listed in Family Search, but we know that he was born in 1764 thanks to Boyd's Index of the Inhabitants of London. There is a two year gap in the recorded Baptisms of the Harwar family either side of 1764 so perhaps it is there in the original register or BTs. Henry appears to have married Anne Braddock sister of Thomas Braddock who married Henry's sister Ellen. Richard married Ruth Alsope? and Sarah Prophet?. Two of Richard's children were Joseph Henry who married Eliza Bull, and John who married Eliza Prince. Henry had four children, two of whom Thomas and Henry married two sisters Sarah and Susannah Arundell, the other two were Joseph and Katherine. As we have seen John b1811 was staying with his cousin Thomas in 1841 before he married Eliza Prince. Please correct me if I am wrong but hopefully that connects things so that all the Law Stationers descend from one Congleton family.
Best wishes
Lincsmaster