A pair of gas-guzzling Bentleys are not the most obvious candidates to burnish the monarch’s green credentials. But news that King Charles is converting his chauffeur-driven luxury vehicles to run on biofuels was this week billed as a small step in a bigger plan to reduce emissions – perhaps the equivalent of lesser mortals separating paper from plastic in the weekly rubbish.
“The two existing state Bentleys will undergo refurbishment in…