I finally got to checking the almost secret notches in the cockpit during a spectacular rain storm. The good news is I now know where water has been intruding on the port side, it is indeed the notch . Starboard no water. Did annyone ever work out if the notch was indeed an overflow from the drain that runs from the vents to the ER .Interesting, I never get water there on the starboard side . Next time on board I’ll have a look at that notch