On our 2003-plate the lighting switch has a parking light position anticlockwise from off. You have to push the knob in slightly to select it. This puts the side and tail lights on without the number plate lights and doesn't activate the chime. It's quite easy to turn the control past OFF to this position if you're not aware of it and you happen to be applying enough pressure to the knob. Maybe that's what caught Malcolm's wife out. It definitely chimes in the normal sidelight position.
- Stoney871 likes this