In BoE Governor Carney's maiden House speech he outlined (in brief) plans to open overnight deposit facilities to financial technology companies.
Its been, up to now, only commercial banks that have had access to deposits at the UK central bank
Using Facebook's Libra (FB's proposed digital currency) for example, this would allow any sterling funds backing the token access to a safe account that pays interest and is devoid of bank charges
I just posted on the weekend price moves for BTC, the developments re FB have been among the catalysts for the crypto in preceding weeks: