This guy is aksing 2100 less for a colour combo I think many would prefer. It does have 10k more miles, but I don't think that justifies your asking price
http://www.autotrader.co.uk/classifi...01305036595249
There are others that are pricing theirs above or equal to yours but imo are delusional and maybe trying to cash in on the summer.
This dealer is selling one for 16,450
http://www.autotrader.co.uk/classifi...01305216874700 and once again a more desirable colour combo
A lot of these private 330i's are in 335i territory in terms of pricing.
disclaimer: I drive a silver with black leather E92
Personally out of all the 330i's on AT I'd be taking this one:
http://www.autotrader.co.uk/classifi...01304306526609 22k and an absolutely stunning colour when the suns out.