Ok quick update, had the side grills off, O/S no pipe at all, N/S rubber pipe with joint as described, so I split the joint dug a little deeper and squirted the rear washer, this pipe is the feed for the re washer.
So it appears the moon roof has NO drains and relies on a water tight seal. I found the adjuster screw on each roof latch, there was loads of room fir adjustment, so did so. Now just gotta wait a bit and see if it's now sealing