It's a common trope on this site that people wholeheartedly believe the legal systems of the world should and do conform to their personal beliefs, no matter how outlandish.
I can assure you that this is such a scenario, as a restaurant in the UK is absolutely responsible for providing safe toilets for their customers, especially if a risk has been brought to their attention.
As a wise man once said:
> The British legal system is and always has been a litany of injustices dressed up in formal attire. To be avoided at all costs.