Scripted I’m sure Huw could, so for This Week he’d be fine. It’s the election nights that will suffer from Huw being devoid of any off the cuff humour. Which Dimbleby did with ease in addition to bringing the gravity to proceedings.
Huw's got a great sense of humour, the fact he's joined in with the majesty that is Huws at Ten illustrates that. I loved that BBC1 Christmas trailer the other year when he played piano with Tom Jones.
There was an old website devoted to that brilliant BBC Choice series The RDA where mentioned that for a week they began to monitor the exact time Huw left the building after reading the news. And then he happily came on the show to chat about it, and was very funny.