I have to agree with the other reviewers - this is an incredibly disappointing book on all levels. Tim Heald is, apparently, a Fellow of the Royal Society of Literature. On the basis of this particular book, one wonders how he was ever granted such an honour. The prose is appalling - full of endless repetitions, clichés, badly-constructed sentences and (frankly) boring irrelevancies. The insight is nil. No biographer should impose himself on the text, at the expense of the subject, in the way that Heald does. At times (especially in the self-important and utterly pointless "Notes" at the end), the biography seems more about Heald's thought processes and (questionable) research than about Princess Margaret. He complains far too often about how he was not allowed to quote the entire text of letters from Princess Margaret, which he then proceeds to paraphrase (probably at greater length than the original letter!). The letters quoted are, however, of little or no interest or relevance at all. There is far too much of his own opinion of people's behaviour, a huge amount of gossip and tittle-tattle (disapproved of, but then quoted and discussed at length) and far too little of any insight into a complex character. He is far too keen to speak about how he met Royalty, how he had lunch with the Queen Mother and visited Glamis Castle with Lady Strathmore and so on. The apparent purpose is to demonstrate how good his sources are. However, if the product of these sources is utterly trivial, what does it matter? And as for the endless quotations from other people and other books.... Trivial to the nth degree.
The footnotes are absurd, and often wrong (for example, the late Duke of Devonshire is treated as the late Duke some of the time, but held out to be alive at other times, often the footnote simply repeats the main text it is supposed to illuminate, and so on). Names are misspelled - often given different spellings in the same sentence. His use of names and titles is inconsistent.
All in all, a very cheap, shoddy, sloppy, frankly tedious work of no scholarship, insight or interest whatsoever.
I cannot recommend it too little.