As Morton explained, Margaret “had always defended the queen and was always loyal to her.”

So, when Diana went against the royal family, “she felt Diana let her sister down.”

Margaret and Diana remained neighbors at Kensington Palace during this time, however.

Princess Diana attends a royal dinner

And, in sharing this place of residence, they knew its innermost secrets.

They originally met in 1995, at the Royal Brompton Hospital, where Khan worked at the time.

It seems Diana’s one-time ally wasn’t quite as clueless as the People’s Princess assumed.

Princess Margaret and Princess Diana smiling

Dr Hasnat Khan visits a hospital