Squiggle, that would be frightening when the lights suddenly fail. I hope he's able to get his bike fixed today as it's too dangerous to use otherwise. It may be something simple like a wire which has become loose.
You could well be right EL. Obviously wedging a bike in the back of a Transit van and then driving over 70 miles through sometimes twisty turny roads is not easy, our hearts were in our mouths about whether the bike would fall over and my grandson did say that one of the straps was pressing on the wires. I am sure this guy that my grandson knows will get to the bottom of it, I hope so anyway.