Why we use progressive enhancement to build Gov.uk
This may not go down too well, but it is an opinion I heard and I personally agree with (having worked in UK gov institution and that far from GDS):
GDS is wasting taxpayer money, spending way too much attention on minute details like apostrophes, CSS and stuff.
Given that most of *.gov.uk are standardised now, it works out to literally millions of GBP per line of CSS.
In an ideal world we'd have fully accessible web, progressive enhancement, responsive layouts etc, but any real business has to say stop - this does not improve our services that much anymore, whereas GDS are free to to redesign their CSS over and over, just because no one else in the government understands technology.