01/07/2008 10:07. Prince Charles only gets round to driving his beloved 38-year-old Aston Martin a couple of hundred miles a year, but as he tootles round the roads of Gloucestershire, critics may be reassured to learn that he doesn't have a tiger in his tank but converted plonk. And what's more, patriotically, it's English plonk.

That his car has been converted to run on bioethanol, made from surplus wine, was one of the minor examples of Charles's green credentials touted in the annual review of his income and activities published yesterday. What's more, all the prince's other cars - Jaguars, an Audi and a Range Rover - have been converted to run on used cooking fat.

The full-colour 60-page annual report - which contains 43 pictures of the prince and the Duchess of Cornwall in its first 40 pages... // guardian.co.uk