Santander UK Online Banking Outage Disrupts Thousands of Customers

Thousands of customers lost access to their accounts on September 25, 2026, when Santander UK suffered a significant online banking outage. The disruptions began in the mid-morning, affecting both the bank's website and its mobile applications.

Santander UK later confirmed that website services were restored, though it continued working to resolve remaining issues. The bank apologized for the inconvenience caused by the technical failure.

The outage occurs as the bank integrates TSB following a £2.65 billion acquisition in May. Under CEO Mahesh Aditya, the bank recently pledged to maintain its current branch network, including TSB sites, until 2028. This incident follows a broader pattern of instability in the UK banking sector, occurring one month after Lloyds Banking Group customers experienced two separate mobile app lockouts.