Hello MWS and thankyou for replying so promptly.
Yes Mary is still in Summer Lane in 1841 and also in 1851 (Widow / Occupation Green Grocer).
Her age is stated as 50 (b.1791) in 1841 Census, but age 42 (b.1809) in 1861 Census. She dies in 1856 at No. 25 Court, Hospital Street, age 65 yrs.
So...