Indeed. When I asked Peter's school if he might learn Latin at home and sit the GCSE through the school, they gave me the CLC, plus a book called Essential GCSE Latin, which has all the grammar in it. Why they put it in an extra book I don't know but it is no doubt very profitable for the educational book publishers.
I learnt Latin initially from a wonderful woman who told us stories she made up herself, but I realise not everyone has such fortune.