There are two ways of downloading a copy of your order invoice;
1. Log in to your account and click on the order number you need an invoice for, then towards the top of the page you will see "Download Invoice" in blue. Click on the link and a new tab will open with the order invoice.
2. You can find a copy of your invoice in the order confirmation email you receive after placing your order. Simply click on the "Download PDF version" link towards the bottom of the email and your invoice will open in a new tab.