Does anyone know of a method that can render only the objects in a reflection without the World colour being included?

I have the render layer set up to render only the mirror and the objects. I have the Output set to RGBA and the "transparent" checkbox ticked in the Film panel.  

In the picture attached the top image is the render from Blender, and the bottom picture is what I want to get.

Rendering in Blender 2.69 using Cycles with a glossy shader on the mirror.

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