Before we can progress with this we need know the information from the marriage certifcate so we find John in the censuses.
I take it you don't have the marriage certificate?

It might be a good idea to purchase it - we will at least then find out father's names and occupations, ages of John and Jane, etc which may make it easier to trace the families in the earlier censuses. And of course you will be sure that you are following the right families.
I ws just about to post this and saw your message. The GRO is probably the easiest. Do you have the reference details for the marriage from Freebmd?