Much though I would love to see Gareth, and especially, Kai, back again at the next Hub, I've voted for RTD. I've been to talks of his before and he is a wealth of information, and also so entertaining. I think he'd fit in well with whoever the other guests end up being. I don't mean this to sound harsh but I'd rather have some of the production team who have worked on many episodes, than an actor who has only guested in one or two.