around London, one of Europe's largest wastewater treatment works and the UK's first large-scale desalination plant--both at Beckton in east London--and the £4.2 billion Thames Tideway sewer (which went into service in 2025). Per day, the company supplies 2.5 e9l of drinking water and treats 4.6 e9l of wastewater. It serves a population of 15.5 million