There is a death of a Mary Ann Taynton age 55 registered in Lambeth district in 1845
and a burial of a John Taynton age 32 on 24 Jan 1819 in Lambeth - residence Stockwell.
The nearest Mary I can find in 1841 is a Mary Tanton, living at Harriot Street Lambeth, but with several Tanton children, but they may not be hers, could be nephews / nieces.
added
The Mary Ann who died in 1845, lived at East street before her death