Hi Shane,
Got Thomas Sinnott and Mary Doyle's wedding certificate today, thanks for all your help.
I now know that Mary was born in 1851, so she is not your Mary born in 1841. I know that her father was Patrick Doyle, a labourer and I believe her mother was Eliza or Elizabeth Doyle. One of the witnesses at the wedding was Sarah Doyle, possibly a sister.
Thanks for the help.
Angela.