I had a recent experience that some drivers will learn from. It certainly caught me out. I recently purchased a second-hand car (07) from a reputable dealer. The car was exactly what I was after, except for it being fitted with privacy glass all over except for the windscreen. Being a mature sort I would not have chosen this myself but I was happy to accept it after a visual check revealed what I believed to be an original manufacturer's stamp on the front passenger glass showing it complied with the legal requirement of a minimum 70% of ambient light being let through. I subsequently discovered that a layer of tint had been applied OVER the fitted glass and stamp. You can imagine my surprise when I was recently pulled over by traffic police on a motorway for the sole reason of, you guessed it, testing my front passenger windows. They failed the test according to their measuring device. Whilst I fully accept that ignorance is no defence I naturally pointed out how unaware I was that my glass was contravening the law and that I did not have it fitted (which I can easily prove). The officer conceded that such an offence is not part of an MOT, which strikes me as a bit of an oversight. Since the tint on my windows did not appear to me to be any worse than a normal pair of sunglasses I had no concerns. I was issued with a non-endorsable fixed penalty of £30, which is bearable. However your readers should be aware that had it been during the hours of darkness, I would have committed an endorsable offence and had a prohibition order applied for good measure. This would have led to an expensive recovery. I will not contest the issue and pay up but do you know of where I can get my glass independently tested? It begs the question do some of us wear sunglasses that fail to admit 70% of light?