Thank you Oriel.
You never know! One clue seems to lead on to something else in this game.
I only discovered this, as when Sarah Thomas, nee Rees died, she named a W.A. Burton, as her grandson.
My research tells me that he would have been Eliza Couzens Thomas' son. She would have been only 3 when Sarah married her dad, the Rev. James Hughes Thomas. Thus, I imagined she only knew Sarah as her mother.
Anyway, your contact may tell me that the Rev.'s first wife may have been a Martha Couzens and that is why three kids have this as their second name!
Keith