Troubled supplier Thames Water has said it remains locked in talks over its proposed rescue deal with creditors as it revealed soaring revenues and customer complaints due to bill hikes.

The debt-laden group – Britain’s biggest water supplier with around 16 million customers – said discussions were “positive” but ongoing with Government and regulators to agree a deal to turn around the firm and repair its stricken finances.

Thames Water is currently in talks with a consortium of its main creditors, named London & Valley Water, which has submitted plans to pump investment into the utility and write off debts in return for more lenient performance targets.

But Thames Water warned there was still a “material uncertainty” over whether the deal would be secured.

It said: “Since the proposal

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