I have just searched the name Postlethwaite and i found Myles Postlethwaite Sawrey. I know Postlethwaite is a rare name in the Isle of Man and i am descendant of the Postlethwaites. This Myles has not been brought to my attention before, however i do have a John Postlethwaite in my tree (born 1761) that was married to Martha Sawrey (born c.1765). Just wondering if you have any other information regarding this.