Buying any hotted-up premium car that's over 10 years old is a gamble. Don't forget, that car would have been £60K new, with servicing costs to match.
Here's HonestJohn's own guide to the model: https://www.honestjohn.co.uk/carbycar/land-rover/range-rover-sport-2005/good/
My 10p's worth is, it's likely to be a bottomless money pit. They were notoriously unreliable when new, and after 11 years and over 100K miles it will not have got any better.
Unless it's had a replacement supercharger, the blower WILL be knackered: the seals will be failing so you'll have low boost pressure, poor performance AND possible oil consumption problems. And that's before you get to problems with the extremely complex air suspension, electrics and more.
The car is expensive for what it is, and could easily need another £10K of work putting into it. Be very, very wary.
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