Re: best place to sell my 156?
I sold my last car in the Autotrader within 1 day so would recommend this, quite a few are advertised on ebay too so wouldn't hurt to stick it on there.
Pricewise, as a guide, you could use parkers.co.uk and also look at prices of similar cars for sale in your area, then add a bit on for extras you have, don't expect to get anything near what you bought it for though. I paid slightly over the odds for mine back in February - £7,500 from a dealer so it had new cam, service, 12 month warranty and 12 month MOT. It's a 2000 selespeed with sport pack 3, rear spoiler and fARsh.
Sensible and descriptive advertising is the way to do it wherever you decide to advertise.