Well I've just fitted my Reversing cam on the Rangie.
Ebay purchase for 1p (plus £10.99) postage from Hong Kong  :D 
Lead for the TV/Nav system was £29.00 Ebay again though I had to fiddle with a couple of pins and relocate them to get the RV cam input fine.
Relay and a couple of hours tinkering and sorted.  Reverse cam now come on the Dash screen when reverse is selected.  8)