My perspective on that one is broadly "screw 'em". If you buy property over a bar or restaurant that was there before you I don't think you should then be allowed to turn around and act surprised that there's a bar or restaurant downstairs.

The problem is, it's not that easy. In the end the law matters - it was just that no one cared for decades, even though the noise from the bars was far above the limits. The old occupants just paid shit in rent, the new ones pay through their nose and expect something for that amount.