For those who may be interested in this thread, I took the car in for its major service (local independent) a bit early, and explained the noise to the mechanic who has lots of Porsche experience. He agreed about the ATF level, but as I couldnt definitely say the noise was the auto box, he suggested that it could also be low power steering fluid.
During the service, he gained access to the engine and the power steering reservoir, where he found it almost dry!
He topped it up, finished service and left ATF alone. No noise yet, and fairly confident the problem may be solved.
I will update if not the case, but this may be a good pointer for anyone else. This fix cost 500ml of fluid. I gather, this level is not always checked at Porsche necessarily, due to the extra effort gaining access..
Thanks for advice received here, certainly helped me out.
Regards,
Martin.
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