A marriage I'm interested in from the 1930's doesn't appear in any of the online civil indexes or records.
I happened to mention this absence to a relative of the now deceased couple and was told "they married at night".
I've also heard the expression "married behind the alter" in a similar context.
In both cases I take it to mean financial or other circumstances meant the usual matrimonial celebrations were not an option.
Would this explain the absence of the civil record but not the parish one?