I have the new HDR-1000S with only one satellite cable.
Last night, I set up a recording for the film Valkyrie on Channel 5 from 22.00 to 00.25.
While waiting for the film to start, I watched another film, Brassed Off, on Film4 from 21.00.
At around 22.15, I realised I was still watching the same film while the recording of the other should have commenced. I did nothing. I continued to watch Film4 until the film finished at 23.10.
This morning I checked to see what, if anything, had been recorded. I was amazed to see Valkyrie was there. It was recorded as two items due to the Channel 5 news interrupting but it was there.
So, how is it possible to watch one channel while recording another with only one satellite cable?