I was watching the program on BBC1 this evening called saving lives at sea. Between the kids not sleeping and the phone going I had paused, watched, paused, watched the program.
I was quite happily watching the program and the "watch in HD" sign popped up in the corner. Forgetting I was watching in catch up mode I pressed OK. The Humax switched to BBC1 HD and the currently playing program at that time (totally ignoring the program I was watching in chase play).... the news! I didn't get to see the end of the Saving Lives At Sea program.
Don't be like me, don't press ok to switch to HD when in chase play.