Watch the video to hear from Sarah Cullen – Head of Procure to Pay at Marks & Spencer talk about their latest process improvement project in Accounts Payable. helped Marks & Spencer significantly reduce their GRNI balances, improve their controls and support the resolution of issues on a timely basis to ensure all invoices are paid on time every time. Marks & Spencer are also using supplier portal to provide invoice status and payment information to reduce the volume of queries handled by the vendor helpdesk.