The Golden Knight Tourist was manufactured for Farmers Trading Co. Ltd by Westco Products Ltd in 1949.
6-valve, 6- or 12-volt car radio. 5" permanent magnet speaker. Positive or negative earth.
Appears to be a Westco model 39 as seen in The Golden Age of Radio, page 84 (Westco manufactured a number of Golden Knight models).
Chassis Notes (most schematics can be clicked to download a full size version):