In This Week's Watchlist Julia Raeside previews the new horror film Us, written and directed by Jordan Peele – she also reviews the new series of The OA and comedy, Home. In The Maths of Life, Dr Hannah Fry covers the gory business of the first vaccines, and why standing still on an escalator can get you up it quicker. Finally, Vicky McClure and Martin Compston joins us to talk about the highly anticipated new series of Line of Duty.