Victoria Coren Mitchell hosts the quiz where knowledge only gets you so far – logic and lateral thinking are the vital extra ingredients.

Two teams from previous series return for a battle royal, and the questions are as tricky as ever. HENRY IV, RICHARDII, KINGJOHN and HEN RY VI – what's the connection?

(And no, those aren't typos – the layout is significant…)

Victoria Coren Mitchell hosts the quiz where knowledge only gets you so far – logic and lateral thinking are the vital extra ingredients.

In a 'books special', two teams from previous series, both taking their names from giants of literature, face fiendish, bookish questions.

For example, what's the connection between the following: Brown symbol, Conan Doyle world, Bryson continent and Milton paradise?