How accurate is the Netflix series "the crown"?

by friendlymarmite

Was the marriage of Phillip and The Queen really that awful early on? Was Queen Elizabeth II really that anti living at Buckingham (the word 'hate' is used)? Did queen Mary truly write a letter to queen Elizabeth II on the news of her fathers death? Are any of the letter read out accurate?

Derizion

Follow up question: was the Queen's education as poor as it sounds in the show?