no civil certs pre 1877/8 - all you will get for your money from General Registry is a certified copy from the film available via LDS fam hist centres
However if looks as if your sarah boyd was d/o edward boayd + possibly elizabeth frazer (she was a scot) - he was a coach man at Ballabrooie Cottage in 1851; he is likely to be s/o edward boayd + hester/esther christian bapt malew 18250918

John moughtin is likely to be s/o Patrick moughtin + margaret craine - labourer living with fa-in-law henry craine + wife margt christian farming 40 acres at ballasalla in Jurby
(margaret judging from age + birth parish is likely to be d/o thomas christian + ellinor caine bapt Malew 17840224 (a late child for mother )