The death cert has arrived.
Ann Rebecca LARCHER d 23 Jul 1838 at 10 Gibraltar Gardens, age 54, wife of Andrew LARCHER a weaver. Informant Andrew LARCHER widower (his mark). This has to be my Rebecca. I don't know where the name Ann is from (maybe the registrar made an error which Andrew, not being literate, would not have noticed or, more likely, the grieving Andrew got confused and gave his daughter's name by mistake).
The age of 54 gives a birth year of c1784 - which is 20 years after the baptism of Rebekah daughter of John HARTLEY, mercer of Fleet Street. Perhaps my Rebecca was the daughter of a brother of Rebekah?
The search goes on!
Philip