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Cryptocurrency scams are using images of celebrities and upmarket London addresses to hoodwink consumers into parting with cash, Britain's Financial Conduct Authority has said.

The warning, first made in June, was reposted on the FCA's website on Friday.

Cryptocurrencies such as bitcoin and ether are not regulated in Britain, and the FCA said it has received a rising number of reports about investment scams that claim to offer high returns.

"UK consumers are being increasingly targeted by cryptocurrency-related investment scams," the FCA said in a statement.

"Cryptocurrency fraudsters tend to advertise on social media, often using the images of celebrities or well-known individuals to promote cryptocurrency investments."

The ads link to websites for investments either using cryptocurrencies or traditional cash.

"The firms operating the scams are usually based outside of the UK but will claim to have a UK presence, often a prestigious City of London address," the FCA said.

Given that cryptocurrencies are not regulated, consumers are unlikely to get their money back, and are not protected by the Financial Services Compensation Scheme, the watchdog said.