Yes it is the marriage register details I wanted, if it were possible. The Kent records for marriages at Holy Trinity at Milton by Gravesend are available online. I don't suppose the ones for St. Peters, Maldon, Essex are, though.
I was mistakenly looking for a marriage for Mary Ann PORTER and there was one in Kent, but I should've been looking for Mary Ann SMITH's marriage in Maldon, Essex.
The census records you kindly sent seem conclusive. So, I probably don't need further evidence of the marriage. But, if you have other census results, I'd be grateful.
Sorry to have been so confusing.
Jamie