I've seen a 2006 06 is220d se, slate grey, black leather, navigation etc etc, one owner, 56k(60,000 service done), approved used so with the years warranty, £9k. I think its about £700 over what it should be. I'm going to have a look and see what room for moving they've got.
I did go to a BCA auction, a 2009 is220d se-L with 27k went for £10300+£530 buyers premium.