Loved this mini-series. These days, they usually go on for too long, but there's not an ounce of fat on this one and it breezes by in six episodes.
Gemma Arterton shines as the funny woman, and Rupert Everett is quite hilarious, seemingly channeling Alastair Sim a bit. The rest of the cast is excellent, and the script is very fine. I haven't read the book, so I cannot compare the two, but I found this totally enjoyable and highly entertaining. The recreation of the 1960's was very good, including some imaginative use of vintage films of London with Arterton skillfully inserted into them. Highly recommended.