I am no expert in the water industry just a layman’s view. The oweners of these water companies are largely hedgefunds, banks, foreign governments even 70%+ thought to be overseas. They have no interest other than profit.
The regulators seem pretty toothless, £90M is a significant fine but I doubt the owners will care too much. I expect they will make sure it is paid for through cut backs in staff, scaling back on improvements in infrastructure and wastage etc. However the biggest loser will be the customer in increased billing charges. The mishmash of owners should be stripped of ownership going by their track record. The management are calculating or incompetent probably both.
Water should be like energy and other essential services like railways, state owned and run