What happens if you press red anyway? It can often work, even if the prompt isn't there.
Your V6 has 6 recording tuners continually buffering the previous hour, and if one of those is on BBC1-HD, you can simply press rewind on your remote to go back.
If you know you'll want to watch a particular programme, then recording it will always be the better option - and you can watch a recording live if you want to. It's just a very good way of having the programme you want, on your box's hard drive.
Alternatively, if you load the iPlayer app from Home > CatchUp> Channels > BBC iPlayer > Channels > BBC1, you can "watch from start" that way.
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