Bank Manager is a highly specialised, web-based expert system designed to meet the operational, clinical, and safety needs of the UK transfusion community. Developed through years of collaboration with UK transfusion professionals, Bank Manager is the first stand-alone, multi-site hospital blood transfusion management system built using web technology. The system supports comprehensive blood bank operations, enabling safe, efficient, and compliant management of blood components across multiple hospital sites. Its powerful hub-and-spoke architecture ensures that while each site maintains its own workflows and rules, a centralised view is available for overarching management, reporting, and compliance. Bank Manager has been designed to seamlessly integrate into existing healthcare infrastructures, offering full interoperability with Patient Administration Systems (PAS), Electronic Patient Records (EPR), Laboratory Information Management Systems (LIMS), and external organisations such as NHS Blood and Transplant (NHSBT).