Apple has abused its dominant position by charging app developers an unfair 30% commission through its App Store, costing British consumers up to 1.5 billion pounds ($1.8 billion), a London tribunal heard on Monday.

The UK Competition Appeal Tribunal has dismissed a legal claim against technology giant Apple and online retailer Amazon, which had alleged reseller collusion. The litigation was led by consumer law scholar Christine Riefa and sought redress for 36 million British consumers who had purchased Apple or Beats products.

Apple and Amazon have successfully fought off a mass lawsuit in Britain over alleged collusion between the tech giants to remove resellers of new Apple products from Amazon's website, a tribunal ruled on Tuesday.

A lawsuit claiming that Apple and Amazon colluded to fix the price of Apple products and reduce competition, has been rejected by a UK tribunal.