ubc control unit

i've recently had this replaced on mine, it started with the cruise control not working and showing an electrical fault on the display , took it to the dealers and it cleared on the way there!
then a week later the tailgate would not open and at the same time the rear wiper decided to stop as well.
thank godness i took Foxy's advice and took out the extended Renault Warranty and it was covered although i got stung for £176 for 2 hours of "diagnostic work" whilst they found out what the fault was the robbing gits..
i was told that a new UBC unit is £600 alone, is this correct and what does it do?
has anyone else had theirs replaced .
 
There's a fuse box hidden under the battery and aux air inlet. Renault state the fuses are NOT avaliable separately. If one blows they will charge you for the whole unit instead of simply changing it.

I'd imagine you fell into this particular trap.