But surely any owner wealthy enough to purchase one new or new-ish -has enough of a fortune to run one ?
You'd be surprised.
My friend bought a brand new Bentley Continental and only lasted 3 months with it because he was sick of filling up with petrol all the time. Not the cost of filling up, it was how far it wouldn't go on a tank that annoyed him.
Not that much, he got 22 mpg out of the S65 and 15 mpg out of the Continental. Iirc both have a 90L tank, so it does add up.
Edit: 20 Gallon tank x 7mpg is another 140 mile out of a tank...
...if only I had the £40K
From the same garage in the OP
How about a 59 plate CLS 63 for £34K?
Used Mercedes-benz Cls Saloon Cls63 4dr Tip Auto | Quickars Ltd.
It's only done 15 K miles too.