Whenever I go to Suggestions on the V6 box, there are none. I'm not sure I am seeing the point of this feature. I have two dozen shows 'thumbed' (which is odd in itself, because I have 36 shows on Series Link, and I thought every series linked show got a thumb).
One of my series links (which is mysteriously no longer thumbed) was The Big Bang Theory, but the box didn't bother to record the two tribute shows that were aired on the same night as the final episode.
One of my series links is Horizon, but there are two shows in the Horizon strand that my box didn't bother to record at all (on 1 July and 8 July). They weren't in Suggestions either.