Thanks for all your feedback and suggestions. I must admit I’m a little reluctant at this stage to adopt the Botswana Top Gear how to drain water from a car method on a new car, though I remember many years ago owning a Hillman Avenger that I always had the floorpan drain plugs removed to avoid passengers having their feet washed every time. Sounds like it’s time for some more entertainment for the neighbours, getting my wife to spray me, sorry the car, with the hose and having a look around, noted that the heater is one of the first prime suspects!