ENGLAND'S LOVEBIRDS

05/03/1999 at 12:00 AM EDT

Britain's Prime Minister, Tony Blair, says he thinks Prince Charles and Camilla Parker Bowles should be left alone and allowed their private happiness. Charles, 50, and Mrs. Parker Bowles, 51, appeared as a couple last week for the first time in their decades-long relationship, posing for photographers as they left her sister's birthday party. Though the response generally was favorable, their appearance angered a large segment of the public, who are still rankled by Mrs. Parker Bowles' intrusion into Charles' marriage to Princess Diana.