What is ring-fencing? The largest UK banks are required to make core retail banking services (ie taking deposits, making payments and providing overdrafts for UK retail customers and small businesses) financially, operationally and organisationally separate from the rest of their business (ie investment banking and international banking activities). Banks that have been separated, or ring-fenced, from the rest of their groups in this way are known as ring-fenced bodies (RFBs). Ring-fencing was introduced by the Financial Services (Banking Reform) Act 2013 (FS(BR)A 2013) and came into effect on 1 January 2019. The Financial Services and Markets Act 2000 (Excluded Activities and Prohibitions Order) 2014, SI 2014/2080 defines which activities RFBs may and may not carry out. Significant changes to the ring-fencing regime were made by the Financial Services and Markets Act 2000 (Ring-fenced Bodies, Core Activities, Excluded Activities and Prohibitions) (Amendment) Order 2025, SI 2025/30, which entered into force on 4 February 2025. What restrictions apply to ring-fenced banks? Dealing in investments as principal Dealing in investments as principal is an ‘excluded activity’ under the Financial