I worked for a US government contractor. According to US law, any software we sold to the federal government has to make accessibility a primary concern. The company never paid more than lip service to the idea. (The closest we ever got was showing that a particular screen reader _could_ make sense of a very very small part of the application.)
Eventually the company was sued by a former user who had been fired from a US government job for low performance when using the company's software. The company settled out of court for some amount of money, but never changed the company policies. To my knowledge, that company still doesn't take accessibility seriously despite the law and despite having settled at least one court case about it.
Perhaps the UK is able to enforce their requirements in a way to actually cause changes in behavior, but it wasn't the case in the US in the 2010s.
