As has been said previously - DON'T repair the dash unit yourself or go to a third party company to have it repaired - Renault have acknowledged this fault as a manufacturing fault and will replace the unit for £100. There's no need to contact Renault UK - just contact your nearest renault service centre (the official ones) and they will book it in for a fault diagnosis and repair.
My scenic dash flickered a few times and reset the clock and then died. It's on an 05 plate and out of warranty. Renault bear the majority of the cost - and I worked out fairly quickly that to buy the unit alone would cost more than £100, so I've left it with them.
I also got a courtesy car thrown in for a minimal insurance cost too - worth being nice to the service reception staff and asking what they can do if the part is non stock and will take a couple of days to arrive ;-))
Katie's Dad, February 2011