May not be relevant, but there are two entries on the 1871 and 1881 for a Mary Gadsby, china dealer, born in Northamptonshire:-
1871 - Allen Road, Hornsey, Edmonton, Middlesex, unmarried, b 1822 in Northampton.
1881 - Allen Rd Shop, 42, Hornsey, Edmonton, Middlesex, a widow, b 1822 in Northamptonshire. The birth town/village is not transcribed but looks as though it starts with Wad*****.
David