Ok, so my control box overheated out on a run. The big thick red wire had worked lose and the poor connection melted the corner of the control box, plus one component next to it (not sure what it was).
I've soldered a new component back on, reattached the red wire (properly!) and discovered that the motor seems to run continuosly when the battery is connected (the switch on the handlebar seems to have no affect).
So I had a lovely drive around for just over 2 minutes, disconnecting and reconnecting the battery in order to slow down or speed up, and then nothing from the motor at all. No click, nothing.
Any ideas anyone?
* Why didn't the motor switch work?
* Why did the whole thing suddenly die?
My 5 year old son was mortified! He'd been waiting hours to have a ride on my lap