If the box isn't switched on, it won't be doing anything, so of course you can't start watching anything from the beginning - it wouldn't have a clue what you were watching.
But.... if the box is switched on and time shift is enabled, then as soon as it is tuned to a channel, it is automatically saving the program, so you can hit pause or rewind and skip back up to an hour - up to the point at which you switched to that channel. If you switch to another channel, you lose what's been saved, and it starts saving that channel, from the point at which you switched to it.
So, if you leave the box on, pop into the garden, and remember 20 minutes late that Dr Who is on, as long as you left it on the right channel, just press rewind.
Or, as I often do, press Pause when a programme on a commercial channel starts, and go fetch a beer or make coffee. Come back in a bit, press pause again to start watching, and fast forward through the ads to catch up.
If you're not sure if you're going to be home at all, or if you don't know when you might get to watch, set a recording for the programme, using the EPG in the usual way, or by pressing Record twice while you watch, and choosing when you want the recording to end.
If a proper recording is happening, you can switch to another channel, or come home whenever you want, and then call up the list of recordings via the Archive button. Select the recording while it's still happening, and press OK. You'll start watching it from the beginning while it carries on recording the end. You can fast forward through the adverts and catch up that way.
Nigel.
