Just a quick update (sorry posting is going to be quiet whilst I'm working all morning and house hunting all afternoon/evening!). Google Reader recently added a few new features which broke the stylesheet created by Jon Hicks. A new version has been released on User Styles which I discovered today. I've installed this and disabled Jon Hick's via Stylish and the new one works pretty nicely.

So if anyone's using Jon's stylesheet and suffering with a broken display then I recommend trying this one out until Jon has time to update his own.