The coroner conducting the inquest into the death of Diana, Princess of Wales, has spoken to French justice ministry officials about the 1997 fatal crash.
The coroner was expected to visit the tunnel where the pair died
Michael Burgess met the head of criminal affairs, Jean-Claude Marin, on Friday to exchange information, officials said.
He was also due to visit the Paris crash scene in the Pont d'Alma tunnel.
Mr Burgess has asked Scotland Yard to establish if there is any truth to foul play rumours surrounding the crash.
The crash happened as Diana and her companion Dodi Fayed were being driven from the Ritz hotel, followed by photographers.
The French inquiry in 1999 blamed chauffeur Henri Paul, who also died, concluding he had taken a cocktail of drink and drugs and had been driving too fast.
But conspiracy theories about the deaths have persisted.
The new inquiry is being overseen by the Metropolitan Police Commissioner, Sir John Stevens.
He has said they will look at every single part of the allegations and, if necessary, they will interview Prince Charles about the death of his former wife.
Last month, ex-police chief John Stalker said Prince Charles should be quizzed over a letter in which Diana reportedly said he was plotting to kill her.
The ex-deputy chief constable of Greater Manchester Police said the prince ought to be given the chance to deny the claim, apparently made in a letter Diana wrote about 10 months before she died.
Conspiracy theories surrounding the deaths include royal fears that Diana was to marry Mr Fayed, who also died, and that an alleged pregnancy was a motive behind "plots" to kill her.
Former royal coroner Dr John Burton, who was present at the princess's post-mortem, has dismissed the pregnancy claims.