Very readable. Aitken is no sycophant, drawing attention to Thatcher's weaknesses as well as her strengths. If you lived through the 1980s it will bring back memories, and also provide fresh information and insights into a period that stopped Britain's post-war decline.
It's basically well written and informative. There are flashes of brilliant writing. However, as it develops, the script becomes repetitive. The author repeats many set phrases and descriptions of events that become quite unnecessary; it reads like there's been a lot of copying and pasting instead of cutting - never mind the pasting. More robust editing would make this an even better book to read. Disappointing on that basis.
What an insider portrait of a driven politician! Her utter conviction that she was invariably right seemed to keep her immune from criticism even when this was justified, alienating many of her loyal and effective cabinet. Particularly in later years, this led to bad, idealistic decisions. The description of the atmosphere in cabinet is a revelation - not to be missed.