Is there a 3rd switch for this? If yes, what operation?

[Zephyr]

Quite curious to know if there is a 3rd switch for this panel.
and if yes, what does it do?

 

[DomiMik]

Not a switch, that's the place for the alarm light:

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[Zephyr]

Thank you!

 

[the Nefyn cat]

And if you fiddle about under the centre console for a while the roof switch can be made to live at the front end, if you've got any spare holes there. Makes it a whole lot easier to get to. Lazy tw@, ain't I?