Ken Wharfe, the Princess's former Metropolitan Police bodyguard, told The Daily Telegraph: "If these parents were so concerned that this information was relevant or had some general import, then they should have delivered it to the inquest.
"Why has it taken so long to air this new information? It seems so shallow to me. I just think it's a bit of a publicity stunt.
"For what reason I'm not certain, but in the absence of any real evidence, I'm sure this will go away."
More top news
Questions on Russia and Syria are sure to dominate Defence Secretary Michael Fallon's meeting with his US counterpart Ash Carter.
Smoking could kill two million Chinese in 2030 with the country facing a "growing epidemic of premature death from tobacco".
A great-great-great-grandmother has become an unlikely star at the age of 93 after her grandson shared a video of her dancing to rap music.