Doctor Who: "The Rebel Flesh"

Non-spoilery: was it just me, or was this episode difficult to watch? In the sense that I couldn't see what was happening on the screen, I mean. It might have just been the time of day and the angle I had my screen, but in the end I had to close the curtains and turn off all the lights, and I was still having trouble following events.

( Spoilers call it decommissioning )