Rob,

That is interesting because John Devereau & Maria Lowe are my 2xGt Grandparents.

I am not so sure of the Irish connection though. John and Maria are on the 1851 census in the IOM viz:-

1851 Census
H0107 2525 352
9 69
Fort Street, Douglas, IOM
John Devereau head 40 Driver of Royal Mail b England
Maria wife 27 Domestic Duties b England
William son 4 b Douglas
Elizabeth dau 1 b Douglas

Maria is we believe born in Cuckney Nottinghamshire and is the daughter of Stephen Lowe & Elizabeth Annabel who are in the IOM in 1841 & later.

Are you descended from William Devereau & Eliza Hawkins through their daughter Elizabeth who marries George Victor Withy. I am descended through William's younger brother Robert Frederick.

If you post your e mail address we can exchange info