This from a girl who bought a set of coasters featuring H8 and the girls on her honeymoon:
I freaking loved that book. I have read all Allison Wier's Tudor histories, which make a great companion to differentiate between truth and dramatic licence.
Be careful about Gregory's backlist, though, I picked up her Wideacre books and was horrified and disgusted. I'm no prude, but incest is too much for me.