Firstly thank you for your replies.
My 'King' family originated from Emlaghfad, Sligo.
William King was born in Emlaghfad in 1792. His wife was called Letitia. I cannot say for certain that it was Letitia Minchin however this is the only marriage in that time period.
They had, from what I have found so far, 6 children together; Thomas, the eldest was born in 1837. Tying in with the marriage the previous year. There children were all, I believe, born in Emlaghfad. I have found 3 of them in Emlaghfad records but 3 are missing.
Eastersnow church, if my location is correct, is the next church of Ireland from Emlaghfad. I noted that the address given on the marriage record was 'lately of' which tells me they wasn't permanently residing there but maybe it was Letitia's family church they attended and returned there for the marriage.
William King died somewhere between 1844 and 1854.
Letita now a widow came to England sometime after 1855 but before 1861. She lives in Lancashire with four of her children and her unmarried sister in law, Mary King born 1790.
Kind regards, Vicky.