This model made from brass belonged to my grandfather (born 1910). It was most likely made by RAF Groundcrew either during trade training or during free moments in units.  Mounted on a solid brass base. Noticeable repair between the ramjet and fuselage. See photo 

Height  18cm

Wingspan  8.5cm

Nose to tail 10cm

Base 7.5cm diameter 

General condition very good for age .