I know that, as of the latest series, there's quite a few who've appeared a fair few times: Jo Brand (24), Sean Lock (21), Phill Jupitus (21), Bill Bailey (19) and Rich Hall (19). Everytime I turn on QI, I see Jo Brand on it. >.<
There's some continuity, yes, I guess that's the good thing. But I just... don't find him that funny, and think he detracts from the bundle of awesomeness that is Stephen.Really? I think Alan Davies helps to tie the show together and gives it a bit of continuity and some running jokes (his 'love' of Pliny the Elder for instance, or Classical Greek). Then again, I also find him to be extremely hilarious most of the time.
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