sewerage

The water companies - along with the regulator Ofwat and the Environment Agency - decide when and where sewerage investment will be made.

The commission's role is to promote the interests of water and sewerage customers and ensure Scottish Water provides cost-effective services to ministerial objectives.

Instead, most pay for water and sewerage services as part of their council tax, with the amount linked to their property's council tax band.

The billionaire's group also owns a 76% stake in Northumbrian Water Group, which provides water supply and sewerage in the north east of England.

Additionally, they have promised a A$5bn boost to infrastructure to support local councils by paying for water, power and sewerage at housing development sites.