A senior official at the UK’s primary financial watchdog has called for caution among the public when it comes to trading or investing in cryptocurrencies like bitcoin during UK’s Financial Conduct Authority (FCA). As reported by Financial News London, Woolard specifically underlined the significant gains made by the likes of bitcoin in recent times. The regulator underlined digital currencies’ volatility, referring to bitcoin’s value being less than a third of the all-time high in June last year.