Using sunglasses in already reduced visibility is dangerous and could actually cause more problems than it solves. I am not sure how your insurance would stand up either and I think there are laws in the UK about using certain things in certain situations. The Highway Code states that tinted glasses should not be worn at night or in poor visibility.

The best advice for the best safety if it is raining and you cannot see where you are going is to pull over and stop in a safe, legal place, and resume driving when it is safe to do so.

As for aquaplaning. It will happen mostly at speeds over 50 mph but can happen at lower speeds. Much is also dependant on the condition of your tyres too. Once again the safest advice is to drive to the conditions and reduce speed where there is a build of surface water, at least doubling stopping distances between you and any vehicles in front.

This is how I was taught with the IAM and it has always served me well thus far

mp