Sideways Steve said:My philosophy is RORO - Rains Off, Roof’s Off or alternatively Rains On, Roof’s On.
That has always been my policy but I recently changed it.
Something to consider: On 3rd of October last year I set off on my usual 23 mile drive to work at 06.45. It was 3 deg C outside and top was down as usual. Shortly before arriving at work I had a heart attack, fortunately I was close to a hospital and ambulance was with me within 5 minutes. The medical staff advised having my hood down in a 3 deg C ambient didn't do me many favours. In hot and cold temperatures the heart has to work harder to regulate the body temperature, in addition, apparently the blood becomes more viscous at lower temperatures and breathing in cold air is not good either.
Driving with my top down didn't cause my heart attack, Angina was the cause, but it may well have contributed to it happening when it did. It isn't going to stop me driving with my top down, that is why I bought the Z4 in the first place, but I am a little more cautious now. As an aside if you are thinking you are fit and well and it will never happen to you, that is what I thought. I am not overweight, watch what I eat, don't smoke, drink sensibly and am very active walking miles with my dogs every week at pace.
i was tailed by a patrol car for 25 mins through Birmingham around midnight at 2 degrees 
