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Erm, had a conversation with someone in the know about electrical matters. Apparently corrosion on contacts can have the same effect....
Going to look for corrosion caused by interior water leaks - I noticed the sunroof was leaking on my wee boys head, so 2+2 = 4.5 or thereabouts.
Check out my thread in the bodywork section if you want to give the sunroof seals and glass a properly good clean (Espace III - 2001 model)
So, now going to double check engine bay also as it may yet be temperature related, corrosion related, or both at the same time. It would certainly explain the analogue but not intermittent nature of the problem.
Still not convinced there is anything wrong with the display as it functions perfectly when it decides to come on.
Currently in Spanner_Brain's garage:
2001 Grand Espace 2.0 16V privilege, Audi A4 2.8 V6 Quattro