Maybe selling my 8 :(

[jza8]

Hello guys! I'm looking to get a new van for my work and unfortunately wouldn't be able to keep the 8, so just wanted to get some opinions of how much it might be worth realistically. To start off it's a silver 2004 Audi A8L 4.2 quattro LWB pre-facelift with black leather interior. It's done 147000 at the moment, drives faultlessly. Has full service history - the last being major service when she had the cambelt, waterpump, pulleys, thermostat etc. changed. Has also recently had full gearbox oil service by ZF Dortmund. The tyres are also quite new - Michelin Super Sports. Now to the good bit - this car has HUGE, MASSIVE spec - top of the range etc. , jokes aside it really is good spec. Aside from usual A8 stuff - black leather comfort seats with heating, ventilation, massage all round, being LWB it has rear electric seats as well. Has rear blinds, AMI, Hybrid-Digital TV, Bluetooth, DAB, RVC, keyless entry, lighting pack, quad zone climate, xenons, bose. Hopefully didn't leave anything out.
So bearing in mind it's quite a good spec and very well maintained how much would be a fair asking price?

Some pics: