Over four episodes, the Houses of Hogwarts will battle to see which team knows the most about the wizarding world. Dame Helen Mirren hosts.

Tonight's battle of the Hogwarts houses sees the wise and witty Ravenclaws go up against the proud and ambitious Slytherins. Dame Helen Mirren hosts.

Dame Helen Mirren returns to the Wizarding World to host the wildcard game, with more trivia than you could squeeze into a cupboard under the stairs.

One house will win the inaugural Hogwarts Tournament of Houses trophy.