I've never had much of a clue what kind of person Fanny Cradock was off screen. On the surface, what bits and pieces I've seen of her TV show always made her seem very quick on her feet, somewhat posh in a calm, intimidating sort of way but most of all perfectly confident. Very little (if any) of that attitude is to be found in this film. Julia Davis comes across uptight instead of posh or intimidating, and constantly nervous and easily upset instead of calm and confident. (That includes the TV show segments so it's not a matter of the movie implying Fanny might have looked formidable on TV but was actually insecure and neurotic off camera.)
I just couldn't recommend this film - when even the obvious stuff is so far off base (whether that's on purpose or because Davis just couldn't pull off a proper Fanny is another matter), I simply can't lend any believability to the more complex parts that are meant to be dealing with the woman's private life and personality while not so subtly passing judgment on both every 20 minutes. 2 out of 10.