That's only if your local water service uses chlorine. Most in North America that I'm aware of have switched to chloramine but I'm sure there are some smaller population centers that haven't. It would take several days under outdoor sunlight (for the UV) with heavy airation to get the same results. So far as the UK... Not a clue.
Just a note, chloramine is essentially chlorine bonded to ammonia.
It really is sad isn't it... But these "buisnesses" will never go away. When one goes under another pops up.
Chris