@UKPLC is electronically linked to Companies House and forms new companies using its website. This gives you a brand new company and, depending on which package you select, the company can be formed with directors, company secretary, shareholders, share capital and registered office of your choice. 

Shelf companies are already incorporated and have existing nominee directors, company secretary and shareholders.  These companies have been dormant from the date of incorporation and depending on age will have had dormant company accounts filed and annual returns will also have been filed.  HM Revenue & Customs will have been advised that the company is dormant.