The rover has 49K miles on it and comes with a 12 month unlimited warranty.
That's good news. The bad news is that in month 13 something really expensive will probably break. If you're serious about buying it try to include an extended warranty as part of the transaction. If the dealership will give it certified pre-owned status then you should be able to buy a longer warranty, but given the vehicle's history they may not be willing to go that far. Can't hurt to ask. I paid for an extended warranty when I bought my CPO Jetta Cheaterwagen and it more than paid for itself when the high-pressure fuel pump went out.
A more fundamental question you might consider is whether you can afford long term ownership of the most complex Range Rover yet made. I don't know much about them, but I'm guessing the L405 is not as user-friendly as the Classic or even the P38 to work on for the amateur weekend mechanic. You'll either need to invest in specialized computer diagnostic equipment and be prepared to learn a lot, or be prepared for $3,000 visits to the dealer. Either way, my sense is that L405 ownership is not for the faint of heart or shallow of wallet. But you'll be loving the ride every second that it's running well.