Whilst sat waiting to find a parking place at a nearby supermarket , I felt the rear of the car give a little nudge ? Looking in the mirror to check if someone had bumped me but no one was there ! As I moved I heard the occasional knock from the exhaust so I pulled in to see the strap had given up causing the box to fall.
Once home , on my cold windy drive , I managed to fit a strap that I had started to make earlier this year as an experiment but I had to improvise it's fitting by using a couple of jubilee clips to attach it at the top but we are good to go until the spring I hope.