Enable UAC via GPO | Windows 7

We are removing local admin rights from systems and require the Administration prompt for non Administrators.

I'm trying to enable UAC via GPO for a basic setup of "Administration Prompt" however the GPO settings for UAC are not working correctly. The GPO is applying the settings configured however when checking UAC in Control Panel the slider doesn't change position and no prompt is display when logged on as a non local admin.

The problem isn't with the GPO being applied but with the UAC settings. The current GPO settings applied are:

1. User Account Control: Admin Approval Mode for the Built-in Administrator account:Disabled
2. User Account Control: Behavior of the elevation prompt for administrators in Admin Approval Mode:Prompt for Credentials
3. User Account Control: Behavior of the elevation prompt for standard users: Prompt for Credentials
4. User Account Control: Detect application installations and prompt for elevation: Enabled
5. User Account Control: Run all administrators in Admin Approval Mode: Enabled

I've looked at: http://technet.microsoft.com/en-us/library/cc772207(v=WS.10).aspx but not sure what settings are being missed to enable it correctly. All other settings are set to "Non Configured"

Anyone have any pointers?