This article will explain how you can purchase additional IP addresses for your 123-reg VPS.
In the VPS section, click on the Manage link.
Click on the Manage button next to the package you wish to purchase the additional IP address for.
Click on the IP tab.
Click on the Buy more IP addresses button.
Choose how many additional IP addresses you wish to order.
Click on the Add to basket button and complete the order by following the payment process.