More votes for Libby Purves, for all her "How not to..." books, "Nature's Masterpiece" (a reprise of lots of the How Not Tos, with some extra bits) and "One Summer's Grace" (a lot about sailing but also about travelling with small children) and Naomi Standen.
"The Science of Parenting" Margot Sunderland
"Night Time Parenting" Sears & Sears
Totally to admit it really as despite also being a Christian I disagree with her publicly held opinions on all other subjects, but really enjoyed, and agreed with a lot of "Child Rearing for Fun" by Anne Atkins
Have also recently been impressed by "Your child your way" by Tanya Byron, with some reservations. And I don't like the way she has simply reprinted all her old columns at the back without coming clean about what they are (they are "dilemmas parents often pose" to her apparently...)
Any good book with toddler entertainment ideas, e.g. "Wonderplay" by Reitzes & Teitelmann from the 92nd Street Y (bit American though)
Am a bit of a saddo about parenting books of all descriptions.