96 Discovery Heater Control Illumination - How to get at it ?!!!

Hi All

Can anyone suggest how best to replace the bulbs behind the heating controls
on a '96 Discovery please ?

I hoped it was a simple fuse that had gone, but can find no fuse that
controls these bulbs (bulb ?)
Having had a good look round it doesn't seem immediately obvious how to
access the area and get at anything that needs replacing.

Can anyone provide any pointers ?

Thanks
Rob