I am a little surprised it was licensed but I guess as a stronly evangelical church they wanted nothing to do with established church ? (you might like to check this as records would be kept - there is still a bethel in Ramsey - between bus station and Parliament street - maybe they still have records) - if it was licensed then they would have had to send details to civil registry - try checking civil reg for that year looking for any from Bethel in case of mistaken names(if it wasnt licensed then it might have been a valid marriage in eye of God (after all Catholic doctrine teaches that the couple marry each other - the minister merely witnessing) but not a legal marriage.