What it's worth depends on a number of things, not just it's "market" value, which I'd say is c.£6k with that mileage and spec, but also who wants to buy it (probably someone on here…) and how badly you want to sell it.
If you're not in a hurry, and an S8 aficionado really wants this spec (which I could understand. personally…
), then it could be worth a fair bit more than market value.
It also depends whether you want it to go to a good home: if I was selling mine - which I'm not
- I'd probably want to make sure this was the case, but maybe that's just me...