Ian I think I have some more information for you that might help.
Bur. St Paul Shadwll 1793 John Lifford Smart from upper shadwick, shadwell
Mar ST Paul 6th May 1787 Sarah Lifford to Thomas Smart wit. Joseph and Martha Lifford
Mr. St Geroges W'wark 13th Nove 1788 Martha Lifford to Thomas Cawood wit. Joseph Lifford, Joseph Lifford, (Jnr) Sarah Smart and Geroge Dawson
Censu 1851 ref ho 107/1517 Clerkenwell Joseph Lifford Age 50 mar Lodger. General Dealer born Shadwell Middlesex.jessie