They do that. You just fix 'em. This was a short in the ignition system which caused the entire ignition wiring to burn out. Took out everything electrical near

They do that. You just fix 'em. This was a short in the ignition system which caused the entire ignition wiring to burn out. Took out everything electrical nearby as well including lights. Fortunately I had a hand crank in the back so it got crank started (took ages but worked) and got it home just before it for dark. Took about 4 hours and £50 to fix it myself. If that was a modern vehicle you'd be screwed so don't have nightmares - it'll probably still get you home with no electrics (if it's pre-defender :)