I am hoping someone has access to marriages for Prittlewell and Benfleet before 1838.
The marriage is between William Mott and Eleanor ? Unfortunately I don't know the brides surname. Their first child was baptized at St Mary Benfleet at the beginning of 1838, so I'm assuming they were married a year or two before.
According to census information, Eleanor came from Prittlewell, she may have married William there but it's possible the marriage took place at St Mary Benfleet.
Sorry to be so vague, but that it the only information I have to go on.
Many thanks Sue