Have you ever wondered why there's no word for that universal affliction of early morning worry & wakefulness? Or how to describe the act of eking every last drop of washing up liquid out of the bottle? Mark Forsyth, author of The Etymologicon, takes Michael Rosen and linguist Dr Laura Wright on a lexical expedition into what he calls the 'sewer system' of the English language- where words lie lost, forgotten or banished- until now. Producer Kirsty McQuire.