Hi,
I too am interested in a Robert John Lindley and a Mary Ann Lindley ,However I have discovered there are two of them which can get confusing ,My Robert Lindley of London married Mary Ann Porter in Saltash Cornwall in 1829 in 1830 they were living in Garlick Hythe london where their son Robert Wharton Lindley was born in May 1830.
Now in the 1841 and 1851 census there is a Robert and Mary Ann Lindley and they have a son Robert born 1832 she was born in Exeter in 1813,I thought it might be my Robert and Mary ,I checked the marriages and found as you say a Robert Lindley married a Mary Ann Wllliams in Lambeth and also a Mary Ann Williams was born in Exeter in 1813,Which connects with the census .They are still there in 1871 with a Grandson.
I have not traced my Mary Ann and Robert, I think he is the one who died and she remarried but I have not traced this ,if you can enlighten me about what you found it would be interesting .
Rosemary