Firstly thanks for taking the time to reply. This has been changed to CMS.Base but the issue is that there are 2 x .dll files being used which I cannot access throwing the error below
There was an error processing the page. The error can be caused by the configuration of some component on the master page. Check the master page configuration or see event log for more details. Original message: Could not load file or assembly 'CMS.SettingsProvider, Version=7.0.4947.22877, Culture=neutral, PublicKeyToken=834b12a258f213f9' or one of its dependencies. The system cannot find the file specified.