I sold my f30 320d recently. Sadly wasnt a great experience at the start. So many timewasters and dreamers taking the mick with ridiculous offers. Found gumtree opened me up to tele sales calls. No response on scphock. I didn't bother with ebay as they wanted a fair bit for a classified ad. Autotrader was the best but be prepared to put up with some nonsense. I essentially cut off people who wanted to knock 100s off by putting 'very close offers only' I did price very reasonable an all. I used the unlimited advert option so it didnt matter how long it took to sell. Essentially helps you avoid panic selling when the advert is close to ending. Think it was around 80 quid but was money well spent. Do your research and hold your nerve. If your cars good priced well it will eventually go to someone who knows their stuff. I eventually got a decent fella who paid pretty much full price. Seemed to know his beemers so hope he looks after my ex pride and joy
