Ofwat's decision to reject Thames Waters' bid to increase prices by 8% is final, but Thames Water could appeal to the Competition Commission.
The company said: "We will review the decision carefully before deciding on our next steps."
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Stena, the company which owns the tanker, says they are unable to contact the vessel, which is now heading towards Iran.
Showers continue into the start of the weekend. Dry for many on Sunday.
The fire at the Holden Tower is thought to have began in a rubbish chute causing heavy smoke to spread to all floors of the high-rise.