it's probably Bearded Ladies or The Consultants
depending on whether it was mainly boys or mainly girls. At least you'll be able to google for them now.
( CowJam, Fri 7 Dec 2007, 10:41, archived)

All guys
Possibly the Consultants... but I'm not sure. I've emailed the beeb to see if they can help: I'll let you know...
( Enzyme is powered by sunlight, Fri 7 Dec 2007, 10:44, archived)

Was it...
... The Museum of Everything?
(happylittletulip helpless and delicious, Fri 7 Dec 2007, 11:23, archived)