What doesn't work on your Discovery?
 

Mine, the door locks and cruise control.

Cruise Control hasn't worked in years.

Cruise control, rear sunroof, (sealed with silicone by PO, probably leaked at some point,) ABS (I disabled it,) rear passenger window control. (Works from the console but not from the door.)

cruise control, maybe headlight sprayers

Abs and cruise control.

I'm noticing a trend here...
Is the Disco cruise control really that crappy, or do most owners (like myself) just not care if it works or not?

My right foot.

The vacuum pump seizes with lack of usage (bad vacuum lines) and weather and is in a tight spot, hard to remove with it's vibration isolators. I got mine to work after direct 12V, sewing machine oil and stiff plastic vacuum lines. No problem in three years. Not the best design but a religious moment (witness a resurrection) once it works.

Cruise and ABS...I disabled the abs

Crap, I forgot the abs and airbag lights are on. My moon roofs work, they just leak. They are sealed now.