Who owns Thames Water and why is it in so much trouble?

Getty ImagesThames Water has been fined a record £122.7m and been told it has "let down its customers and failed to protect the environment" by the water regulator Ofwat.The company has huge debts and is struggling to fix leaks, stop sewage spills, and modernise outdated infrastructure.It serves about a quarter of the UK's population, mostly across London and parts of southern England, and employs 8,000…