We said it before and we'll say it again: There's nothing like a decent Top Gear Special of a Sunday evening. Tonight we're catching up with the lads on their quest to find the source of the Nile. Those estate cars have been through the wars already, what with the mud slides and absolutely terrifying traffic, and now it's up to the boys to get them across crocodile infested waters and on to Lake Victoria. We'll be sad to say goodbye at the end of the show. If you didn't know already, it's the series finale.