The price sounds good (low) for 24k miler 370. I l have looked at mostly everyone that's come up for sale in the last 3 months. I'd expect a Cat D around that price and miles, so get it HPI'd. If it was 24k miles and in top condition needing nothing, I'd expect to see a 2009 low miles for 16-18k private, bit more from a cencent dealer with warranty. Of course depends on condition, miles, year which in that order I buy on.
Personally I'd only go for one with factory sat nav and can if I wanted sat nav, modding can look great but will deter certain onward potential buyers. I like a car standard, with only exhaust and intake mods acceptable to me, but that's just me.
Its probably a good car though and if you're willing to spend the money and time on it as a project and do it right, then you won't regret it. If you're going to spend thousands putting it right however, a clean no issues car with a full unbroken history is out there. If I read it right, no history since 2012, that would put me off. I saw some bad cars in dealers when looking, some of which seemed to have been there for months. Maybe even try push harder on the price if you truly think there's a great car there once you've finished doing what you want to it and spending the money doing so... Great cars to own and drive, already love mine.