The next 12 contestants face a fresh set of challenges based on the games Mensa use to measure IQ, including a code-breaking challenge so complex that the youngest contestant, student Rosie, really struggles with - and not just because she may never have seen a landline phone before. By the end of the episode, only three will earn a coveted place in the Oxford finals.

Alan Carr and Susie Dent challenge 12 more contestants to compete for one of three places in the final by spotting the common link between sets of words, solving an anagram puzzle, and taking a sweet shop-based memory test.

Alan Carr and Susie Dent host a show in which people from across the UK put their brain power to the test in immersive and ambitious challenges. The first 12 contestants face a quickfire round where they must spot the missing letters from the months of the year and a memory game where pairs must memorise the positions of ice cream tubs, toppings and cones.