The book has to say concerns and complaints on the front, you can use any book you like as long as it is a hardback bound book that pages cant be ripped out of.
YOu also need to display the concerns and complaints poster which is available from your are you ready for inspection booklet, this must be displayed in a prominant place for parents to see. The poster gives details about how they complain and must match up with your complaints policy.
Hope this info covers all of the questions

Janie