Firstly I might be inclined to visit schools you are interested in and ask to speak to the SENCO to get an idea of how the schools in question would be able to support your child should they get a place at the school.
I copied this from the CGP website
Do you publish books in large print or Braille?
We're sorry but we don't currently have any books available in large print or Braille. However, we have given permission to the Royal National Institute for the Blind (RNIB) to transcribe our publications. They've already transcribed some - you can search their library here
http://librarycatalogue.rnib.org.uk. We can also grant permission for individuals to make their own enlargements of our material in individual cases. If you'd be interested in this, please drop us a line and we'll look into it for you.
I wonder if their online editions of books would be useful?