The details explained about the UK legalities are correct. But Charlie does not make decisions based on what is legal or ethical, including driving fabrication of reviews and forced ranking to increase the number of layoffs without having to pay by claiming dismissal for cause.
The work from home story is that the evening before the Financial Times in the UK was going to press with a story on Charlie's elimination of work from home for UK employees who were bringing a major lawsuit in response, Charlie was ordered to reverse the policy that same evening to avoid another public embarrassment and lawsuit. The story never made it to press.
What can you do? Press coverage and class action lawsuits same as the UK.