I am happy to see the author mention WCAG and British Dyslexia Association. They seem to have a refreshingly strong focus on accessibility.
I wonder how much of an uphill battle is fought inside the GDS and across the UK government to push for this kind of universal access.
Also, it's amazing how much of a "brand" GOV.UK is for me even in spite of (or perhaps due to?) its accessibility. To me the brand is: big strong blobs of the high-contrast colour palette, GDS Transport (the typeface), and a relatively (but pleasingly) narrow content.