That Rolls-Royce Model
The model Rolls-Royce with a loud-speaker on the roof may be a model of the car owned by Mrs. Violet Van der Elst in the 1930s. Her book "On the Gallows," published by the Dodge Press, London, 1937, contains a number of photographs of such a car (UV 7189). The car was used by her in demonstrations outside various prisons when executions were about to take place.
It would be interesting to know if the car is still in existence.