Hello Arranroots,
Sorry to get back to you so long from the last message, but you are correct, William Griffiths didn't marry a Jane Canton I have now found out that it was a Jane Thomas, they were both servants in a household in St Florence, thats how they met, ( I am assuming ).
I mananged to get their daughter's birth certificate and that's where it states Jane's surname.
I hope you don't mind me writing to you but I just thought I let you know that you were correct.
Thank you
Rhian