Now here's a salutary tale for everyone to take notice of. I had a small windscreen chip, lower driver's side, some months ago and just never got around to having it fixed (it was so small and shallow). I finally made an appointment with Halfords for today - BUT the extremely hot weather this week has produced a 3cm (and slowly growing) hairline crack from the chip and now it's not repairable and I have to have a new screen! Going to contact insurer now for go-ahead, so that will be £100 excess plus £20? on next year's premium. While examining the chip, I found another tiny one a little below as well. At least AutoGlass should have a ready replacement (he said hopefully). Meanwhile, my 56 plate runaround Yaris is still resplendent with its original, unmarked screen.