Here's a little top tip, not applicable to all Jaguar Models, but certainly quite a few.
It transpires that if someone uses the vanity mirror within the sun visors and does not slide the cover closed afterwards, the vanity light can stay illuminated. It should go out when the ignition is switched off, but if left on indefinitely, there is the potential for a fault to develop such that the vanity light stays on, even with the ignition off. Takeaway is to always ensure that the sliding cover is closed on the vanity mirror after use and not simply the sun visor flipped upwards.
N6 JMX