Taxi-hailing app Uber is appealing an employment tribunal finding that its drivers should be treated as workers rather than self-employed.
The October 2016 ruling means Uber drivers are entitled to paid holiday and the minimum wage, which unions estimate is worth about £18,000 per employee.
Uber, which previously tried to appeal the finding but lost in November 2017, has now taken the long-running case to the Court of Appeal. It is being heard at the court on Tuesday and Wednesday.
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The company has said the tribunal has “fundamentally misunderstood” how it operated.
Law firm Leigh Day, which started the legal action against Uber on behalf of 25 members of the GMB union, believes the case could have far-reaching implications for the gig economy.
“This appeal is of great significance not only to Uber drivers but also to millions of other workers in the gig economy and we hope that this can now bring this matter to a conclusion for the benefit of all workers," said Nigel Mackay, a partner at Leigh Day.