[Angst]

Hi,
There are 2 bulbs (1 either side) of the heater controls. The right hand side of mine was dark so I replaced both bulbs - if one's gone, the other can't be far behind.

It's a bit of a pain but I found some useful info here:-

How to replace a blown bulb in the heater control panel

Disclaimer: This worked for me. Your mileage may vary. I didn't break anything when I did this, but that does not mean you won't! Proceed at your own risk. If your car is still under warranty it makes no sense to do this as a DIY job. This has to be one of the most fiddly bulb replacements...

www.mini2.com

Don't do what the first poster suggests and take the whole thing to bits, if you read through to the posting by 'dethbrd' this is along the lines of what I did.