The following is taken from Santander's 2017 earnings presentation dated 31st January 2018.
It appears the plan is to roll it out some time in the next two months.
The presentation also touts a platform for payments using mobile phones targeting those without bank accounts, as well as payment using 'smart watches'.
Note, this is a major high-street bank in the UK, Spain and elsewhere with a 10% market share for current accounts and 10.4% for the mortgage market.
What next - mortgage payments in cryptos?
Santander presentation:
UK current account market share figures:
https://www.statista.com/statistics/387098/uk-banks-current-account-market-share/
UK mortgage market figures:
https://www.cml.org.uk/news/news-and-views/largest-mortgage-lenders-2016/