Scenario description
Assume that by 2027-03-31, UK authorities convert reviews of large banks’ independent backup systems into materially binding operational-resilience requirements, remediation orders, supervisory conditions, testing obligations, or restrictions affecting one or more large UK banks or UK operations of major banks. The action requires banks to maintain, prove, test, fund, segregate, or upgrade independent backup systems or continuity arrangements for critical banking operations if primary infrastructure is compromised. Exact covered systems, test frequency, implementation budgets, deadlines, and exemptions are not specified unless published by authorities or disclosed by affected banks.