This was a high-quality production and pretty accurate historically, at least as far as I can tell from my reading of various biographies and other books relating to the British Royal Family. The only problem I had with this teleplay was its presentation of the character of Edward VIII, Duke of Windsor.
There is one scene in particular, which shows him grabbing Wallis Simpson's backside, which is completely out of character for him. Anyway SHE would have bitten his head off if he'd tried anything like that with her in "real life", because she was always (despite anything else that can be said about her) very conscious of her dignity, as he was also...I suppose the filmmaker needed to "dramatize" what a selfish, self-centered person Edward was, but the characterization given to him in this teleplay is just not accurate, & for me, it stuck out like a sore thumb. Just showing Edward as the weak, stubborn, manipulated man he was, would have been enough -- the teleplay made him downright sleazy, which I don't think is a fault you can put down to the Duke of Windsor, tho' he had many others!