The indicator lights on the dashboard are blinking fast because there’s not the usual load on the indicator circuit from the exterior globes. This is a great way to know if you have a blown indicator globe, as the light on the dashboard will flash faster on the side of the failed globe.

So you need to look downstream to figure out why none of the indicator lights are getting power to them. This could be a broken wire, a body-computer problem, a poor earth or some other electrical gremlin that is robbing the lights of their power source and signal. An auto electrician would be a good place to tackle the problem.

Disconnect the battery and reconnect it again. If it doesn’t take it to a mechanic who should be able to sort it out for you.

Thanks for the tip. It's certainly something worth checking and might provide a simple fix for the owner in question.