Direct copy from Familysearch (cut and pasted)
Richard Marchant
England Marriages, 1538–1973
marriage: 4 January 1813 Saint Bride Fleet St , London, London, England
spouse: Mary Harrison
So 1813******
Same as Anc has.
So not your Marriage.
You have been given all this info already;
MARRIAGE;
From the Sussex Marriage Index :
Richard MARCHANT and Mary ASHENDEN 6 Jul 1819 Peasmarsh
CHRISTENING;
From the Transcripts of Sussex Family History Group :
MARY MARIAMaria Marchant 18 May 1823 Peasmarsh , Richard Marchant, gardener, and Mary.
CHRISTENING;
Mary ASHENDEN Christened 11 Oct 1801 Northiam St Mary , John Ashenden & Mary
AS I said, there is a line between Households on 1841 Census so John Longhurst is not in the same House.
I see no connection with him. He is born Surrey and Mary Marchant in Sussex.