Girlfriends dad called me with not being able to open Internet Explorer so I did the following debugging via Remote Desktop.
Clicking on the tile sends to desktop and Internet Explorer is not opened (not even in Task Manager).
Upon searching for "Internet Explorer" a single application tile is shown with the IE logo and the text "ms-resource:TileDisplayName".
I got round this by pinning
C:\Program Files\Internet Explorer\iexplore.exe to Start and Desktop which is a good enough work-round but I am interested as to why this would have occurred and how one would go about repairing this...