Mungo:
I had a 2004 R470 for 8 yrs (2007-2014).The “major” Problems I had was…New Oil cooler, New Turbo,Main ECU,Rebuilt Compound Turbo,Range Change fell apart,New Fan,Then to top it off the engine block cracked from one end to the other on nearside.Of which I believe is common on these engines…Best of Luck ! I Hope this helps…
Mungo, going to the trouble of sharing your expensive experience for free is very honourable and critically helpful to many.
Many thanks and hope things improved after that.
Best wishes to you and all on here for 2017.