Anyone who mentions JK Rowling or Philip Pullman gets punched in the nose via the internet. We've done them.
Robin Jarvis - I wish he was as successful as JK Rowling. His books are all amazing. They're so terrifying - the Whitby Witches trilogy sees multiple deaths of sympathetic characters, and I'm still slightly unnerved by the anthropomorphic mice being SKINNED ALIVE in the Deptford Mice Trilogy. I've reread lots recently and it's all still brilliant.
Anne Fine - Goggle Eyes and Madame Doubtfire (which is nothing like the Robin Williams appalling adaptation of it) were my favourites. I've not read them recently, but I'm sure the intelligent and funny stories about divorce covering issues including death and anti-nuclear protests would still be a good read.
Brian Jacques - I did love the Redwall series, but I started to get bored as they went on and on. I'm not sure if that's because I got older or because he ran out of ideas.
Judy Blume - I imagine these are very specific to 11-14 year old girls and will have lost their appeal somewhat.