You should order prescription pads through Xerox, who are the contracted secure printers for the production of prescriptions.
You should also contact them if you wish to register, amend any details or authorise additional people to order prescription pads.
Registration Queries and System Issues: 0300 123 0849
Online Ordering Portal: http://www.nhsforms.co.uk/
Order or Delivery Queries: email@example.com