So the latest - I drove over to my parents tonight and got the warning about 5 mins before I got there, when I arrived there was a fast drop of green coming from around the front left suspension - out from the "stiffening plate" and the reservoir was bone dry.

I looked around to see if any coolant pipes looked soaked but everything looked dry (from the top with a torch).

If I had a leaking valley pan pipe it would be shooting into the cylinders wouldn't it and therefore not draining out the bottom so I'm assuming I can disregard that possibility (Is my logic correct?) so my only other guess is that I have a busted fitting somewhere outside and possibly at the back of the engine...

I haven't cracked out the Bentley manual yet but will have a look tomorrow

Thoughts/opinions

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2004 E53 4.4L N62