Every year seems to bring a new slew of auctions selling the dresses of the late Diana, Princess of Wales. This year has seen Kerry Taylor auctions selling a range of  dresses once belonging to the style icon, including a copy of the famous revenge dress. June will see an auction in Toronto, Canada of many dresses that once belonged to Diana. There are some much-loved dresses up for grabs, including the famous blue velvet White House dress  by Victor Edelstein she wore as John Travolta spun her around the dance floor in 1985. There are also a range of Catherine Walker dresses, including a asymmetrical pink sequined gown wore…