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Camilla Parker-Bowles (left) and Lady Diana Spencer (later the Princess of Wales) at Ludlow racecourse to watch the Amateur Riders Handicap Steeplechase in which the Prince was competing. (Photo by PA Images via Getty Images)

Camilla Parker-Bowles (left) and Lady Diana Spencer (later the Princess of Wales) at Ludlow racecourse to watch the Amateur Riders Handicap Steeplechase in which the Prince was competing.   (Photo by PA Images via Getty Images)

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CAMILLA PARKER-BOWLES AND DIANA SPENCER AT LUDLOW RACECOURSE TO WATCH THE HORSE THE IRISH GELDING ALLIBAR WHICH PRINCE CHARLES WAS RIDING IN THE AMATEUR RIDERS HANDICAP STEEPLECHASE IN WHICH HE FINISHED SECOND TODAY. (Photo by PA Images via Getty Images)

CAMILLA PARKER-BOWLES AND DIANA SPENCER AT LUDLOW RACECOURSE TO WATCH THE HORSE THE IRISH GELDING ALLIBAR WHICH PRINCE CHARLES WAS RIDING IN THE AMATEUR RIDERS HANDICAP STEEPLECHASE IN WHICH HE FINISHED SECOND TODAY.   (Photo by PA Images via Getty Images)

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LADY DIANA SPENCER AT LUDLOW RACECOURSE TO WATCH THE PRINCE OF WALES FINISH SECOND ON HIS EX-IRISH GELDING ALLIBAR IN THE CLUB AMATEUR RIDERS HANDICAP STEEPLECHASE. (Photo by PA Images via Getty Images)

LADY DIANA SPENCER AT LUDLOW RACECOURSE TO WATCH THE PRINCE OF WALES FINISH SECOND ON HIS EX-IRISH GELDING ALLIBAR IN THE CLUB AMATEUR RIDERS HANDICAP STEEPLECHASE.   (Photo by PA Images via Getty Images)