I am sure you all know about this but for those that don't....here goes.

If you have an Android phone, download Torque from Play Store, there is a Lite Version & the Full version is only a couple of quid......get yourself one of these....

http://www.amazon.co.uk/gp/product/B00BMHAILG/ref=oh_details_o06_s00_i00?ie=UTF8&psc=1

and away you go.

I know this is probably very limited but it might help find fault codes.

It works on my 1995 4.6 LPG P38 & my sons C220 Mercedes.

Lots of info on the net.

I got this to try and diagnose a fault with my old Merc and while it connected and everything it didn't read the fault.

The live data stuff worked though, and it tracks your position and can present you a map with a colour coded line indicating your route & speed

Not tried it on the RR though as I considered a Nanocom an prerequisite of P38 ownership!

Not trying to suggest it could ever replace a Nanocom or any other fault code reader but for less than £15 total, might help someone trace a fault.