I was up before six this morning. Double checked my son's room and he was fast asleep - he was supposed to be in Chadderton for 6am (12 miles away) for his last practice before his HGV Test. Doh. Anyway, got there a bit late but still in time for his test, which he passed ! Phew.
I then had to drive there with the battery booster as his car was dead. Turned out it was actually a loose terminal connection to the battery, which is in the boot of a BMW. My booster showed it wasn't pushing any juice to the battery at the 'terminal' in the engine bay, so son had to empty his boot to get to the battery, bingo, as soon as the panel was removed, the car's electrics fired up.