The annual subscription is calculated from the month your service joined. As such your you will receive an email reminder two months' before your subscription ends with your annual subscription amount (inc VAT) and service details, requesting a PO number for the upcoming invoice. The PO enables us to process invoices efficiently, reducing the risk of disruption to your accreditation access. To source a PO, please send a requisition to your procurement team or finance department, who in turn will create a PO number. Invoices are issued at the start of the subscription month. If you have any further queries regarding this, please feel free to contact the operational team for clarification via email or ring us on 020 3075 1407.