Firstly, thank you for your review, your feedback is appreciated. To assist you when placing future orders on our website at slingsby.com you can select the 'Pay on Account' payment method and use the Purchase Order Number box to add your Purchase Order Number. If you need to complete your order by Credit/Debit Card or using Paypal then you can email sales@slingsby.com with your Web Order Number and quote your required Purchase Order Number, we will add it to your order details. If you need any further help please do contact us on sales@slingsby.com, 0800 294 4440. Kind regards