Hello hanes teulu, thank you for your reply, assuming the Cefn Iron works is the Cefn Cribwr / Bedford Iron works, it says it was closed in 1836, my 3rd great grandfather was a fireman/ fire man in 1851, this is why I assumed if he was living in Cefn Cribwr he was possibly fire man in one of the other industries stated on the map, a colliery or brickworks maybe? your suggestions would be gratefully received. Regards.