A significant "dieselgate" lawsuit has commenced at London's High Court, targeting five major car manufacturers for allegedly manipulating diesel emissions tests. This legal action could impact 1.6 million car owners and is considered the largest group action case in English and Welsh legal history.

• The lawsuit involves lead defendants Mercedes, Ford, Peugeot/Citroen, Renault, and Nissan, all of whom deny the allegations.
• Lawyers accuse the carmakers of using "defeat devices" to cheat clean air laws, potentially putting millions at risk from increased harmful emissions.
• The trial will test a sample of diesel models, covering nearly 850,000 claimants, with damages to be decided next year, and the ruling will be binding for similar claims against other manufacturers, totaling an estimated 6 billion pounds ($8 billion).