Classical Guitar beginner book

Hi,
Does anyone have any recommendations for good classical guitar tutor books for beginners?
I teach kids from 6 onwards also adults. I use the ABRSM exam syllabus.
I use a couple of books, and they are ok but I feel the older kids find them a bit 'childish'. The 'adult' tutor books tend to be a little harder and too formal for the children.

Just wondering if anyone has come across any goodies?
Thanks,
Jazza