Jaggie:Wouldn't it just make sense to use a hydrogen fuel cell as the Rolls Royce establishment can afford this and its a future green technology which diesel is not.
Not sure it would Jaggie.
If my tongue was firmly in my cheek - I would opine that the average Rolls Royce owner is not too concerned with leaving a carbon footprint the size of Guinea-Bissau in his or her trail.
In fact - the larger the footprint - the better they like it.
These are not cars for shrinking violets and they are all about conspicuous consumption - no more - no less.
No-one with any class or a social conscience actually buys a Roller these days do they?