[Bluewater335D]

so are we are saying that the glow plugs are needed for cold starting, (obvious - as with all diesel engines), but also the Glow Plug controller is part of the regen system and if maybe one or two glow plugs are down, (with the 6 cyl BM engine), the system will still regen provided the Controller is working correctly, (and provided the engine reaches the required operating temperature, i.e the thermostat is working correctly)
and
if there is a fault with the Controller the system will not regen