They are some of the nation's brightest minds, so it is perhaps of no surprise the boffins at GCHQ set a quiz question that left radio listeners stumped. The Countdown-inspired Maths problem ...

Channel 4 aired its latest episode of Countdown on Wednesday, May 3 and saw Rachel Riley back in front of the number board. During the numbers round, and often the hardest of them all, the contestants ...

For almost 26 years, thousands of viewers have tried their luck at a tricky Countdown conundrum or maths problem from the safety of their armchair. The Channel 4 staple has had fans try their luck ...