Hi again, re John Mumford, could he have had a son James who married an Elizabeth Read on 3rd Sept 1850 City of London, St Giles Without Cripplegate as in 1851 a James Mumford occ Lace Merchant aged 33 b London is with an Elizabeth aged 27
Census ref HO107/1505/575/4
Both James/John shown as Merchant at marriage.
Keyboard86
EDIT both James & William had parents John & Christiana, William baptised at St Alban, Wood Street approx 1/3rd of a mile from Ironmonger Lane
Does not answer marriage of William but could be a clue.