Enid Blyton - the Famous Five. Old-school? Yes. Twee? Yes. Fantastical? Yes. It still doesn't make us love Enid Blyton's series any less. All the best things about Old Britain, condensed into a narrative.
Famous Five - Enid Blyton. We weren't well off and I begged and begged for this set of hard covers when they came out in this edition. I took care of them each time I read them like they were made of gold and to this day, except for a little yellowing, they're like new and I love them still.