It's hard to check church records when I can't find out exactly which area they were in. I have managed to get a birth certificate for my great grandmother Catherine Ledger (note sometimes names spelled Ledger and sometimes Leger) which shows her parents as William Ledger (Leger) and Sarah Walker. I have worked out that William must have been born sometime in the early 1800s i.e probably before 1810. The fact that there is no further trace of him leads me to believe he may have been the son who was cut off from the family. My mother recalls seeing a family bible when she was young and it had an impressive family tree in the front but her father didn't like the subject being discussed (jealousy I suspect!) and tore it up!!
It was normal in those days for any children who disobeyed to be disinherited and if the family were powerful they could probably organise destruction of all records. I therefore wondered if anyone working on St Legers before 1800 could perhaps have worked back in my direction!