From Kathleen's notes:
George Lambie, through his wife owned a plot of land and house. (Actually George Lambie had built the house.) It was known as Temple Derville and was originally land belonging to the Knights Templar.
George Lambie's house in 1745 and (had?) the initials of the owner and his wife were inscribed on the lintel above the door according to Scotitish custom [G.L. & J.M. 1745]. The old house was pulled down about 1860 and a new house built and erected at the corner of the street and in West Main Street (Darvel). The lintel with the initials on it formed the lintel stone of the back door. Later the lintel got "scuffed" out by mistake.