It's a guide error and it shouldn't happen, but I have seen the same behaviour myself.
First off, email details of the issue to tivoguideerrors@virginmedia.co.uk - the team won't generally respond, but might just have a chance of resolving this if you mail tonight and they pick it up first thing tomorrow.
There's a workaround, that you change your V6 series-link to be "all channels" rather than specifically BBC1-HD. The scheduling logic will now look for recordings on the BBC regional variations - the 86x Wales/Scottish/NI versions - first. If those have correct EPG data, then your V6 will record from those instead.
You can always change the SL back if you want afterwards.
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