Bitcoin goes mainstream as first City fund house buys £550m of 'digital gold' Ruffer adds Bitcoin to its popular investment trust and £3.5bn Total Return Fund Ruffer has bought Bitcoin to help diversify its portfolios Credit: ROSLAN RAHMAN/AFP British fund house Ruffer has become the City's first major investment company to buy Bitcoin for DIY investors adding £550m of the digital currency last month. The firm, which manages some £20bn of Britons' savings, added Bitcoin into the popular Ruffer Investment Company and its £3.5bn Total Return Fund. This comes as the value of Bitcoin broke through the $20,000 (£14,815) for the first time. The digital currency has been one of the best performing investments this year and has nearly tripled in value.