Did a great little tutorial for the generation of real-time reflections. It's pretty simple to set up and looks really cool! It basically uses a render to texture actor to generate an image that is slapped onto the floor, and is updated in realtime at 1000fps. This means that everything from the rockets from your gun to your player character is reflected on this surface. I highly recommend people try this if you are trying to create a glossy, wet or generally reflective surface.
The texture still needs tweaking and I'm not sure I'll stick with the diffuse material but the principle is there.