Staggered, and not for the first time, by the recklessness of a sizeable constituency of drivers of four-wheel-drive cars in poor weather conditions. I had to drive across the country to catch a flight, which meant driving down the M4 with a mix of snow and sleet in the air and slush and ice on the ground.

The conditions were perfectly manageable, safe even, so long as you treated them with the respect they commanded, which almost everyone did. I was in an Audi TT diesel (which has four-wheel drive) and cruised down the middle the lane at the same 50mph as almost everyone else.

But in the outside lane, whose width was severely restricted by snow encroaching from the central reservation, it was never long before someone in a Range Rover, Cayenne or Impreza came barrelling along as if the conditions somehow didn’t apply to them.

I think the responsibility for this behaviour lies at least in part with car manufacturers who market four-wheel drive as a safety feature.