Which TV box do you have? https://my.virginmedia.com/your-tv-box/index.html
On the TiVo: The live buffer (used for rewinding and also "record" partway through programmes) only works for the channel you are watching. It used to work across all 3 tuners, this changed a few years back.
On the V6: The live buffer works across all 6 tuners, you can check which channels you're tuned to by pressing "info" from live TV and scrolling to the bottom tab.
On either box, the BBC iPlayer app usually offers the "Watch from start" within the app.
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