The BBC has published an article discussing the issues and consumer mistrust of tap water in the UK.  The article is available here: https://www.bbc.com/future/article/20240417-is-filtered-water-healthier-than-tap-water

It discusses consumer awareness, the typical issues found in water, and the different filtration options. Even if you are on town water supply, having some end-point filtration is always a good last line of defence for the health of your family and guests.