Yes, customers of Citibank (UK) can access their accounts online. Online banking services provide a convenient platform for managing accounts, checking balances, reviewing transaction history, and performing various banking activities such as transferring funds and paying bills. To access the online banking service, customers typically need to create a user account on the Citibank UK website and log in using their credentials. It is important to ensure that all personal information and login details are kept secure to protect against unauthorized access. For assistance with the online banking setup or related queries, customers could find useful resources and contact information on the current Citibank UK website.