They are all well-known voice actors, and have voice-agents, so they get a lot of work doing radio/animation voiceovers (as do Little Britain's Matt/David too).
I can't wait to see it. I wonder if they are recording the voices now before they go on tour?
And I'll stay here till the trail's cold and return again with my meaty gold
You want it! You can't get enough of Hilary Briss and his special stuff...