Car windscreen mistake you can make that could cost you £300 and affect your car insurance DRIVERS are being warned about a windscreen mistake they could make that could land them with a hefty repair bill and even increase your car insurance excess by £300. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Benefits of black box car insurance revealed - and they’re not just for young peopleThe hidden danger of keyless ignition cars revealed as 28 fatalities confirmedHundreds of thousands of motorists could be driving without valid MOT, risking £2,500 fineCrackdown on parking offence you probably aren’t aware of that could land you £1,000 fineCar insurance - How married couples can save £200 on their premium costsMercedes-AMG GT S Roadster 2018 REVEALED - Price, specs and performance