Mary, If you have the date of Marriage then I would suggest writing to "The Registries ( General Registry) Deemsters Walk, Bucks Road, Douglas, Isle of Man. IM1 3 AR . British Isles.
Enclose an I.R.C. for postage. Say £1.00 for North America / Far East . plus £6.00 Pounds, or 30 pence postage UK for a copy of the entry.They are very helpful.
"Good luck"
Brian Kneen