At same dealer as C32 spotted this, ok its a petrol but even allowing for a proper 2K LPG conversion it would then give 40+ mpg and looks a lot more than 20K's worth of car??
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That's a lot of car for the money - spec looks OK too - COMAND isn't as common as you'd think, and panoramic roof is very rare. Can't see if it's got Bi-X.
It's SWB and petrol though, which could be forgiven for the price.
Past: 2008 S211 E280CDi A/G Estate, 2000 ML430, 1992 300TE Auto, 1995 E320 Coupe - all gone
Our taxi service here in Amsterdam use them and they have some very nice touches to them. Rear passengers are well catered for and there is lots of space. I would check out the suitability of the car for LPG conversion first (good reports of the cars running well) before putting it on my shopping list though.