(AFP) – After serving English wine at the wedding of Prince William and Catherine, the royal family has now set its sights on producing bubbly. More than 16,000 vines will be planted next week in Windsor Great Park, the former hunting park of Queen Elizabeth II's favourite residence Windsor Castle, in Berkshire, southeast England. Laithwaites Wine, tenant farmers on the royal estates, said they were "extremely proud" to be invited by the royal family to work on the project, but admitted it was only at the "seedling stage".