Back in 2002, when I first encountered the work of Black Sheep at the Edinburgh Fringe Festival, their line of improvised comedy and storytelling was already making its mark.

People loved the spontaneous tales they told, and the complement of their two, very different personalities.

Nine years on, and working as television writers for CBBC, they still have the same zest for invention but, of course, an awful lot more experience.

It's great to watch them playing off one another as they create stories around words chosen by the audience, and as always, they exploit every ounce of potential from moment to moment, conjuring a wealth of characters – often in the Roald Dahl vein of comedy: a purple clad princess who simply can't get enough of her favourite colour until a bottle of purple hair dye sends her bald... a rabbit that turns into a carrot juice mogul... an olive spitting Queen... the ideas come thick and fast!

The triggers they have made to spur each joke into being are interesting too: from music to odd props anything might set them off.

For all those watching, it's a hilarious roller coaster ride of images and ideas!