Bless Wiggle, their sale, and their next day delivery.
They came while I was out on my bike. It was a very bright and icy morning. In some parts the track was completely hacked up by tractor tyres, and the ruts had then frozen, making them lethal, and I nearly came off on the first one, so walked over the next few. I did 15 miles off-road in 1 hour 22 mins, averaging 11mph. Pretty slow, but there was a fair amount of getting on and off, and going through gates. But at least it was quicker than a couple of days ago.