Apparently IE10 no longer supports the IE Maintenance section in Group Policy. (removed from Server 2012 GPMC)
A 2012 Domain Controller is Required for the IE10 Option to appear, so I added DC on 2012 server and then got the IE10 option under GPP (Group Policy Preferences)
I entered the details and applied them but it didn’t work for the user:
It turns out that’s because there’s a red underline (which is quite important), there are function keys F5-F8 to enable hidden options, see here: http://blogs.technet.com/b/
So, I ran F5 on that bad boy:
And then run a ‘gpupdate’ and the settings now work, easy peasy eh?