On now on BBC1. It's about his journey, learning to read at the age of 51, having gone through school as an undiagnosed dyslexic.
From what I've seen so far, he also has what is now called visual stress (formerly called Meares Irlen syndrome), where a coloured overpay helps the letters to stop 'moving'. Of course, when he was at school, such difficulties were not known about.
I'm looking forward to the rest of it.