Does anyone know how easy (or difficult) it is to convert a RHD 2011 Range Rover to LHD?
Who can do it? Are the factory, dealers or specialists doing it and at what cost?
Has anyone info on this?

Huh. Never heard of anyone doing this on anything later than a classic RR (could be wrong, tho). Problem is, I think, that parts are going to be so ridiculously expensive that it will not be worth it - regardless of how cheap the car is. And with the complexity of the RRs from the P38 on, labor will be quite a bit too.

And once the price comes down far enough so that it could become viable with used parts, it won't be worth it because the RRs can be had similarly cheaply in LHD and RHD. 
RRC 2Dr, RRC 4Dr,
P38, and 2 L322s
(wife thinks I'm nuts - prob right, too)

Thank you for your reply. I very much like a 2011 RHD Baltic blue Supercharged Autobiography I could potentially get my hands on.
I quite like Baltic and the factory has stopped supplying this colour after introducing it for 2011 so they are pretty rare and stand out from the black Range Rovers.
The conversion needs to be economically viable though.

it would be much cheaper to get a proper color change than to convert a L322.

i would say that it cant be done due to complexity of the range..change the colour via a wrap or respray as mentioned above..