@21:22 I just pulled the little power cable out of the recorder, waited a few minutes and then put it back, let the recorder boot up, pressed the Freeview/play button (just above the guide button), selected "Recordings" and they were all there again.
When the recorder boots up it should automatically switch the TV to the right input, so you should be able to change channel with the recorder remote control, if you can do that, you wil be able to get to "Recordings" as above.