OK now my screen is well sealed the leaks stopped. But then I cleaned the car and while hosing it down water found its way in via the ventilation area below the windscreen. I think...
Are there any places where HBs will tend to leak in heavy rain around this area? Where should I check? It all seemed to be fairly well overlapping as a design but maybe there is a weak point in the design I dont know about?
I will get Hannah to hose down the car while I sit inside and look for leaks.