Blinding sleet so intense that the windscreen wipers are failing. Sheets of water spreading across the road that no tyres could grip in a skid. Large trucks and white vans in a hurry still making 60mph. I’m in no hurry but the first lay by passes because we could not see the sign. The A12 at lunchtime has my heart pounding and my knuckles cramped by my focus on the road ahead.