Having got 12 GCSEs (A*s in Maths, Science and History and As in the rest), Lauren doesnt have to work hard to prove her brainpower. She is polite and eloquent, speaking with the voice of someone far beyond her years. But theres one person whos taken some convincing of her intellect: Joan, her beloved Nan. "We sat down with one of the Mensa newsletters once, and there are puzzles at the back, and she was like: Come on then, prove it to me! I dont think she meant it, though - my Nan is my biggest fan."