A possible chink in a brick wall?

[Sue from Southend]

James Froude and Elizabeth Gaitt marry in 1843 @ St Leonard's, Shoreditch.
https://www.ancestry.co.uk/imageview...72?pId=5586521

The witnesses are my 3x gt grandparents Charles James Chapman and Martha Chapman.http://www.genealogistsforum.co.uk/f...+james+chapman

Tracing Elizabeth Gaitt's parents I've discovered that her parents were James Gaitt and Sarah Ramsby https://www.ancestry.co.uk/discovery...=successSource

Charles Chapman and Martha named one of their sons William Rumsby Chapman, a spelling/transcription mistake in one of the records perhaps?
I have a few shared matches with descendants of James and Sarah and one of these trees has "given" them a daughter, Martha, baptised as the daughter of James and Sarah Gates in 1802 which would work perfectly for "my" Martha however I still cannot find a marriage for Charles James Chapman and Martha.

Can any one find anything that may confirm that Martha Chapman is the daughter of James and Sarah Gaitt?