Well although I'm using an LCD device to view the image, the video signal itself is simple composite video. I could probably point the camera at a mirror yes - that would give me the effect I want, it's just a case of rigging something up I guess.
Just wondered if anyone had any thoughts on an Electronic solution, if there is one. The only idea I came up with was to digitsise the video signal a line scan at a time and reverse the information, then convert it back to analogue. I'm not sure this would give the effect I'm looking for, and it would undoubtedly be incredibly complicated.