Driving back on the M6 Toll yesterday having managed to get back from Ankara (albeit 48 sleepless hours later than planned) we had a strange experience. We were weren't following any traffic when we heard faint crackling. Then we noticed shiny clear speckles on the windscreen and side windows. It was like wafer thin shards of clear glass. When we stopped they were stuck to the screen. we only had it on this stretch for around 5 miles. The sky was clear and weather was fine and sunny. It wasn't dramatic but certainly noticeable. It may of course be coincidence. Didn't encounter any more of it all the way up to Manchester.