This book is chock full of photos of original Georgian interiors and new-build interiors decorated by Henrietta. On first glance, it looks really good and there is a fair bit to inspire and some lovely interiors to drool over. However, all are very grand and there is little to inspire on a more normal home which leaves it a bit one-sided. It's a bit like looking around a National Trust Country house to see how to decorate a terraced house of the same period.
The thing that really got me though was that the text is all about how she designed this and that and what the constraints were and what the clients wanted. If you want to buy an advert/resume for Henrietta, that's fine, but if you want a book with information on how Georgians would have decorated their rooms and what they would or would not have, it is very lacking. There are occasional gems of info, like the proportions of swags to curtains, but simple decorating basics, like what colours they would have used, the fact that Georgians would NEVER have had stripped pine in their homes etc are completely missing.
Also, some of her decor in the new build American stuff is just hideous! It's almost worth getting the book just for the laugh at seeing the oversized terrible, oh so terrible, family portrait in one of the houses (family standing serenly together on a grand, fictional staircase with swags of fabric at the edge and mother with head tipped to one side...words cannot describe how OMG naff it is). That house itself is just awful as well, as it tries to mix Georgian style with modern build techniques and open plan. As a result, it just all comes out really wrong. Given that getting period stuff to look good is all about accurate detailing and the Georgians valued proportion and symmetry so highly, I was very surprised to see such layouts in a purported Georgian book.
If you want lots of pictures of lavish houses, go for it, but if you want some proper info on Georgian style and advice on how to make interiors work and look genuine - don't buy this book. There are much better ones out there. Try The Georgian Group Book of the Georgian House (particularly good for renovation work) Georgian House Style Handbook, Georgian and Regency Houses explained or Georgian House Style: An Architectural and Interior Design Source Book. Alternatively, just google the subject - there's more decent info online than you get from Henrietta's book.