From BBC News
Amazon and eBay could be liable for billions of pounds in unpaid VAT if they fail to properly investigate traders using their sites to escape sales tax, the BBC has learned.
The online marketplaces could be legally required to spot the tax evasion committed by many of their overseas sellers.
UK firms say they are being put out of business by the unfair competition.
Amazon and eBay said they make all users aware of their legal obligations.