The ECJ has ruled that Dyson rival Bosch-Siemens does not have to state on its product’s energy labels that they were tested in laboratory conditions.

Dyson argued the company is misleading shoppers by exaggerating how efficient its vacuums are because its efficiency tests do not reflect real-world use and that the tests discriminate against Dyson vacuum cleaners because they do not lose power in the same way that bag-based machines do.

The ECJ’s advocate general advised that European laws forbid extra information being published on energy labels.

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