I loved their first TV special, which seemed impressively complex as well as hilarious, but the shine went off it with the following one (which featured David Suchet). It's probably much better on an actual stage obviously.
Pretty good description of this, to be honest.
The Suchet-narrated one was Peter Pan Goes Wrong, which I thought was great. They did another one after it, which wasn't anywhere near as good.
The former was adapted from the stage show, but the latter was done just for TV. Make of that what you will.