Another list from me OP after checking my amazon history for the last 6 months. I now know why I am not rich, I am enjoying this thread myself and making a list:
The Penderwicks is a lovely series, Mysterious Benedict Society, Nurse Matilda series, One Wish, Thirteen Curses, Thirteen Secrets, Thirteen Treasures, How to Train your Dragon series, Hogwarts Library series, Mr Bliss, Farmer Giles of Ham, Ophelia and the Marvellous Boy, all the David Walliams books, The Moffats (series), Emil and the Detectives (series). Classics like National Velvet, Ballet Shoes, Secret Garden. Dianna Wynne Jones books too are fab. Tried a couple of Terry Pratchets which were not well received.
I buy books elsewhere too! Charity shops if they have nice books, in town, anywhere really!
The Legend of the Guardians is brilliant (15 book set) but we had to order it from the US.
DD reads at least two 400 page books a week and our local (tiny & rural) library is rubbish. I have to order everything in, pay 75p and wait for weeks. I gave up on it at about age 6.