The paperback British Gliding Association logbook is fine. Tip though is to keep it between hard covers (e.g. the cover off an old hardback A3 diary) because otherwise your first logbook will end up looking very tatty - reason being that you need to carry it around pre-solo as the instructors generally like to write-up your daily progress. This is an aid (or warning!) to your next instructor.
Welcome to gliding
