Well the Judge says there is no evidence Princess Diana was spied upon.

And now a  French Newspaper claims the Princess Diana death dossier has 'disappeared'. Princess Diana death dossier 'disappears'

Sworn Testimony by former MI6 Agent Richard Tomlinson

The link below is a sworn and testified statement that I have made on 12th May 1999 to the enquiry into the deaths of the Princess of Wales, Dodi Al Fayed, and Henri Paul. I firmly believe that MI6 have information in their files that would assist Judge Stephan's enquiry. Why don't they yield up this information? They should not be entitled to use the Official Secrets Act to protect themselves from investigation into the deaths of three people, particularly in the case of an incident of this magnitude and historical importance.

http://www.globalresearch.ca/index.php?context=va&aid=6665