Thanks for your follow up to my earlier post . Yes you're correct about Mary Ann being listed as widowed , it's a case of conflicting info on the net i think . When i posted that message i'd not long been researching and somewhere she was listed as being married but i have since seen info that states Mary Ann was widowed by 1861 .
I've had to let this search rest for the time being , although it does appear that Thomas originated from Callington and not Stoke Climsland as i then believed .
Thanks once again & if i come across anything that might be of use to you i'll post it here .