Got to admire their solution for transporting a Land Rover to the workshops, mk2 Scammell Explorer and 20 ton low loader. Reminds me of an in service Explorer with a green Minivan on suspended tow parked outside a cafe on the A5 at Cricklewood around 1979.
Thinking about this again, the conventional indicator failure circuit is detecting the presence of an intact incandescent bulb and would only work if the resistor failed, not the LED.