Expansion into a full review to come (if I find the time), but for the moment:
If you even have the slightest interest in Tudor history and politics, run, don't walk to get this book. And for a special treat, also get the audio version narrated by David Rintoul. This is an intense, fact-packed read and (in either the print or audio version) not a book to rush through; but it is SO worth taking the time. What a fascinating personality -- and what an amazing biography.