The European Court has today upheld his arguments and annulled EU regulations on the energy labelling of vacuum cleaners.
Green MEP for the South West Molly Scott Cato has said the ruling is proof that the European Courts are fair.
She said: “This ruling shows that the European Courts system is fair and delivers justice. Rightly, given the huge threats posed by climate change, the EU is striving for high energy efficiency standards.
"But when a reasonable challenge to the way those standards are measured and enforced is brought to the European Courts, the EU’s justice system listens, and forces changes where appropriate to do so. I know from having spoken to Mr Dyson that he is genuinely committed to high energy efficiency standards with his products, so this is a fair verdict from the European courts.”
Sir James Dyson, one of the south west's leading entrepreneurs and strong supporter of Brexit, has recently come in for criticism for announcing his new driverless car will be produced in Singapore rather than the UK.
Previously, he moved production of his bagless vacuum cleaners from Wiltshire to Malaysia.