This is a 12/24 Chassis No 4957 Engine No 8702 of 1924. It has a cone clutch and 3-stud wheels. I do not know the model designation - perhaps you can tell me. The registration is NN8080.
I have several pictures of this and other Lagonda light cars taken between 1948 and 1950 by my father. Are these of interest to you?
(I emailed your myspace friend ViaChaotica before I found this forum.)