Hi Andy,
"Run Report" button is hidden by default. You need to manually enable it. Below is the link to article which describes how to restore a hidden button.
http://www.develop1.net/public/post/How-to-restore-a-hidden-button-on-the-CRM-2013-Command-Bar.aspx
Below is link to similar post.
http://social.microsoft.com/Forums/en-US/b86978d8-c0ee-46fb-8df8-5c5d25089c32/run-report-is-not-coming-in-crm-2013-for-order-form-page?forum=crm
Please vote as helpful and mark as an answer if this post helps.
Ajay Chawla