If the marriage occurred in the County of Conwy, you can acquire a copy of the marriage certificate from the Register Office in Llandudno.
County Boundaries have changed over the years and it may not always be obvious where the event occurred, so do not hesitate to speak to the Register Office for advice.
How to apply for copy certificates in the County Borough of Conwy?
By phone: 01492 576525
Download application form for a copy marriage certificate (PDF)