The King's Speech and the miniseries Edward the King are good.
Century of the Queen Mother 100 years in 100 minutes is a documentary about the Queen Mother.
The Queen tends to be a bit slanted towards Diana's side of the story; no one really knows what was said in the privacy of Balmoral, just the story the biased media wished to tell. The movie does come around a bit in the end pointing out that Diana's sons were the primary concern of the family.
Bertie and Elizabeth is too saccharine a treatment of the life together of George VI and Elizabeth, later Queen Mother.
Edward VIII is a miniseries that is too-pro Edward and Wallis Simpson, failing to see the entire story.
The problem with movies is their slant---I don't like a too-pro or too-anti slant, just a movie that is as accurate, truthful, fair as possible. There are many movies that are full of gossip, inaccuracies, movies that paint the royal in too-good a light.