I seem to have hit a brick wall in trying to get further back with one branch of the family. Other people researching the same family have apparently made no progress as well.
Foster Reynolds (of Mitcham) b. c. 1736 d. 1797. He was a linen bleacher in Carshalton and may well have bought/rented Carshalton House in the 1770s and 80s. I have found two probable sons, William Foster Reynolds Esq of Carshalton House (1767- ?) and Jacob Foster Reynolds (1775-1851). Their descendants seem to be well researched, not least because William's son married Elizabeth Fry's daughter.
Foster Reynolds married Deborah Brady (my distant relative) in 1774. There are two doors I have not yet managed to open, possibly because of the strong Quaker conections of all the families involved.
1. There must have been a previous marriage unless William is not Foster's son after all.
2. Who were Foster's parents?
Grateful for any pointers