Click on any photo to see a larger version...
This model is the Wells-Brimtoy Esso Petrol Truck in Red. This item is friction driven. The company also produced non-friction driven toys of the same size (approximately 3.75 inches or 82mm long).
The model has a diecast plastic chassis with pressed metal rear body. It has been shaped with rudimentary representations of the body lines. There is no glazing. At the front is a cast representation of the grille. The rear body is lithograph printed to represent the rear tank and has signage that reads "Motor Oil Esso Petrol, Highly Inflammable Made in Gt. Britain" on the left side, "Motor Oil Esso Petrol, Highly Inflammable 20 MPH" on the right side, walkway and tanker caps on the top, and a ladder, hose connectors and a number plate [AW 560] on the rear.
The original black plastic wheels are still on the model, mounted on steel axles. The front and rear axles pass through the base, with the rear axle attached to the friction drive motor.
The base plate is a single piece, pressed tin unit. It has been press fitted to the body and the plastic body pins melted to hold it to the body. It appears to be plated. There are no manufacturer's marks on this model, although the country of origin details are printed on the left side of the tank, "Made in Gt. Britain".
I do not know exactly when this item was issued but believe it to be between the 1950s and 1960s.