Hi Jenny, Pre 1855 records, known as OPR's were records recorded by the Church of Scotland, so if the couple were not married in the C of S then you probably won't find a marriage for them. All an OPR marriage/banns will give you is date of marriage, or date it was contracted; names of parties; place or parishes of residence.
Do look out for the 1871 census, due soon, believe it's being tested at the moment to see if it's running ok. Hopefully, you will get the info. you need from this census.
Cheers Liz