Having found suitable men, our next problem was to keep them and nurture them until they were ready. To do that I had to give them work of significance to do, and not treat them as apprentices. As I allotted them important tasks, some of the old guard became apprehensive for their own positions. They saw no reason why these bright, young, energetic men who had not contributed to the struggle, should come in and displace them before they were ready to go.

Running CiRA with some 250 staff, I have come to spend less time discussing their data with my colleagues and students, and have been absorbed by my duties as the "chief executive officer" of CiRA, including devising strategies to advance both basic and applied research and to obtain sufficient funding. Anxious about the lack of financial resources for the future to allow us to continue hiring research support staffers, I even ran the full Kyoto Marathon in 2012 to raise online donations from the public. It was hard but helped us raise more than 10 million yen.

Instead, I’m here to tell you finding your purpose isn’t enough. The challenge for our generation is creating a world where everyone has a sense of purpose.

Of course, the most rewarding part is the "Aha" moment, the excitement of discovery and enjoyment of understanding something new, the feeling of being on top of a hill, and having a clear view. But most of the time, doing mathematics for me is like being on a long hike with no trail and no end in sight! I find discussing mathematics with colleagues of different backgrounds one of the most productive ways of making progress.

Yeah, I try to make sure Sundays I’m about and present. This weekend he wants to do an apple crumble. We’ll normally do some sort of slow roasting in the morning because we’ll be off to rugby training, and then the afternoon when we get back, it’s all cooked and lovely.

With friends, it’s good to know where you stand. I’ve surrounded myself with people who are very open. Lots of the blokes I know are very emotional: we have honest conversations.

The people that already do it, Lourdes Dooley, Aaron Mulliss, Nick Bearshaw, Claire Kreigenfeld and all of their amazing support team, and of course the amazing Alex Longstaff who has to deal with my childish antics on an hourly basis.

Pavarotti’s Nessun Dorma. I’m a big sports fan and Italia 90 was such a massive part of my life when I’d just turned 17. That tune just builds and builds. I can imagine a massive coffin disappearing down while he’s singing. What better way to go?

It’s very easy to get caught up in a habit of work hard and play hard. I couldn’t tell you how much I used to drink in a week – I haven’t got enough fingers. I own two pubs and had built up a reputation of being the best party person in the industry. It got to a point where I realised I was getting too old to be that guy. Now I enjoy the challenge of being on a stag weekend for three days, but drinking Diet Coke and coffee.

There’s a huge amount of chefs that I find inspiring and have been influential in my career from early days. People like Marco Pierre White and the Roux brothers are amazing, but even now there's some fantastic young chefs that are creative and exciting.