Before Andrew was two, he recognised the numbers and letters when Countdown came on TV in the living room of the family's flat in Dundee.
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"Genius Andrew Halliburton" was how the Sun referred to him. But for a shy boy, talking to the media was tough. "I could hardly get my words straight," he says of a TV news appearance. "That built up a lot of pressure for me before the exam."
He ended up with a grade two. He took his highers more slowly, got top grades and went straight to an applied computing course at university. For years, this had been the ultimate goal. It was a disappointment. "I was pretty disheartened when I found out it was a lot easier than I'd expected," he says. "Uni was the one time I had a bit of trouble making friends, which was strange because I was with my own age group."
He dropped out in his first year and got a job at McDonald's. Out of place, and unsure of what to do with his life, he nearly got fired. "What could be worse than getting fired from McDonald's?" he says. Five years later, he is still there, a humble crew member who sometimes enjoys the surprised look on customers' faces when he does the sums in his head rather than going to the till. He's not bothered by the geek tag – "I always thought of myself as a bit of a nerd" – but balks at the word genius. "I never liked the term." Was it a burden? "Certainly. I always felt I had to live up to that genius moniker, I never once thought I could."
It shocks people, Andrew says, but he doesn't really like maths. He's going back to university in September, this time to pursue his real passion: computer game technology. "I always thought my parents wouldn't accept that," he says, but Al is "over the moon". "I was disappointed when he left university, but we didn't fall out. We expected a lot. We expected him to do well. I'm not saying he didn't live up to my expectations, because he went and got a job, but McDonald's is a bit of a dead-end job." Andrew looks at his mum and dad. "I feel I haven't lived up to my expectations," he says.