Police protection for Prince William's girlfriend has been stepped up as paparazzi pursue her in an eerie reminder of how they shadowed William's mother, Princess Diana.

Images of Kate Middleton already attract thousands of pounds & with media speculation rife that William is set to purpose, photographers are following every move of Britain's possible future queen.

"William is very angry that nothing has changed," one courtier said of the prince's fury over the paparazzi that made life for his late mother & have increased their surveillance of his girlfriend.

Ten police officers were summoned to protect the couple after a trip to a London nightclub. They keep a watchful eye as she heads off to work every day as a fashion buyer. Media reports say she has been given a police radio for her protection.