I have found a way around this but it requires the latest admx templates. There is a option to display the private store within the Windows Store App.
[TABLE=width: 2426]
[TR]
[TD=class: xl65, width: 331]Only display the private store within the Windows Store app[/TD]
[TD=class: xl65, width: 178]enabled[/TD]
[TD=class: xl66, width: 1214]Computer Configuration\Administrative Templates\Windows Components\Store[/TD]
[TD=class: xl65, width: 703]Stops the Windows Store from loading..[/TD]
[/TR]
[/TABLE]
When the Windows Store is loaded it will just show a white page and say that the store app is blocked and wont show the update icon in the top right hand corner.