PimpMyMagic: Even more amazing it cannot use the output data stream to record to two files at once (for the overlap period).
Therefore it demands both tuners to record the (in this case) TV1 overlap.
Yes that is ridiculous isn't it. My hope it that it was more of an oversight, or lack of development resources at HybridTV modifying the TiVoHD for DVB-T. I am hoping (probably in vain) that it may one day be fixed in a software update.
I'm also hoping that when I get around to replacing the PROM and hacking the software that the addon EndPadPlus will go someway to solving this issue.