Amazon is facing a $1bn (£889m) lawsuit in the UK over claims it abused its dominant position by favouring its own products.

The case is being brought by consumer rights advocate Julie Hunter, and her lawyers said it centres on “a secretive and self-favouring algorithm” used by the tech giant to promote its own products through the “buy box” feature on its website.

Items selected for Amazon’s “buy box” are more visible to shoppers and, therefore, have a head-start in achieving sales, said the lawsuit.

It claims the online market place breached competition law, abused its dominance in e-commerce and obscured better deals by leading customers towards these featured offers.

Ms Hunter said in a statement: “Far from being a recommendation based on price or quality, the buy box favours products sold by Amazon itself, or by retailers who pay Amazon for handling their logistics.

“Other sellers, however good their offers might be, are effectively shut out.”

The proposed case is being brought on behalf of British consumers who bought items on Amazon since October 2016.

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It is on an “opt-out” basis, meaning any potential claimants will be included in the claim unless they choose to opt out.

The lawsuit is expected to be filed at London’s Competition Appeal Tribunal by the end of October and will need to be certified there before proceeding.

An Amazon spokesperson said in a statement: “This claim is without merit and we’re confident that will become clear through the legal process.

“We always work to feature offers that provide customers with low prices and fast delivery.”

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Amazon has faced a number of other competition investigations in recent months, including in the UK, Europe, and Australia.

In July, the UK Competition and Markets Authority, said it would investigate Amazon over suspected anti-competitive practices, including how it selects listings for its Buy Box.

That same month, Amazon promised to treat all seller equally when ranking offers for the buy box – it was among several concessions made to the EU.

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