When you say you "have a marriage in 1824," do you mean you have found the marriage in the parish registers, but the wife's surname isn't given or do mean that you surmise that the couple married about 1824 based on the baptisms you have found, or that you've found a marriage of a couple with the right names, but are uncertain if it's the right couple?
The first would be rather odd. Though not impossible - far too often vicar's seem to have left surnames blank, presumably intending to fill it in later, but I've never seen it on a marriage. Are any witnesses to the marriage recorded in the register?
Re-reading your post, I don't think you mean the second option.
If it's the last one, then are there other marriages of couples with the right names around 1824? You might have to research the other families to rule them out. If you follow the wife's family upwards, are there any names that get re-used in the couple's children? Are the couple still around on the 1841 census? If so, do the details match one of the couples better than the others? Is the first child born/baptised in a different place to the others? If so, that might be the mother going back to her mother for the birth. If there is more than one matching couple, then have you traced each of the families to see which can be ruled out?
