The expert claimed views will be particularly keen to hear the former royal couple spill details about their unhappy time as members of the monarchy.
He said: It will have a global audience and the millions who will tune in to 90 minutes with Oprah, will be especially interested in what made them so unhappy in their life as senior working royals.
The expert claimed the Palace may be unable to defend itself against Meghan and Harry s words.
Mr Fitzwilliams added: The Palace will therefore view this with very considerable apprehension, they are simply unable to counter whatever is said.
Mr Fitzwilliams also claimed the interview is a savvy PR move from Meghan and Harry as it will help to boost their brand.