it may be the light behind the button, not the actual fuse ^_^
I think that fuse is most likely to be among those by the steering wheel
(as opposed to those under the bonnet)
Does the demister still work?
I really need to get one of those pen things off ebay/amazon to fix mine
(the circuit is broken in a couple of places across the window,
so the window doesn't clear veryt well in a couple of spots,
the pens have conductive/metallic ink to complete the circuit)