Renault Espace lights won't turn off?

I have a 2001 Renault Espace. The headlights came on yesterday when I was not in the car. They could not be turned off. The key was not in the ignition. I tried turning the lights on/off switch, tried starting the car - nothing worked.
In the end I removed the fuse, which did work, though also turned off the radio, which should have been a different fuse.
Help!
Michael, October 2018


done
In fact I've just checked; it is the stereo fuse that I've removed.

Michael, October 2018
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