On a school trip to Wales when I was 12. My canoe capsized and got stuck upside down next to a rock. I was underwater for about 30 seconds but it felt a lot longer.

Brighton, 1984. I was in another hotel just a few yards away.

Being about nine metres away from a polar bear. In northern Canada, a young polar bear was very intrigued by our food. I was flying the drone at the time and the polar bear looked up and started paying attention, so then we flew the drone further away and he followed it while we got into our vehicles.

Ten years ago, I went to visit my dad in Australia. I walked to the edge of a cliff and looked over and tripped. I righted myself but my head was over the edge. No one saw it.

Jason Queally, a former teammate. He is older than me and was Olympic champion in Sydney. The way he mentored me, even though he knew I would be a rival, was amazing.

I don't enjoy it but I know that I have got to live with [myself] if I'm not going to give it 100 per cent. The key thing is getting to the start line and knowing that I couldn't have done any more, that I didn't back off. You accept the pain, because if you didn't there would always be that element of doubt.

Max Levy, a German sprint cyclist who came second behind me a lot.

The six Olympic gold medals, because at school I was never great at sport. When I look back on my career I think, how on Earth did that happen?

A road track car, a Porsche GT3. I’ve done the 24-hour race in Le Mans, which was a dream come true.

Scotland’s rugby captain. My hero Gavin Hastings was captain when he came to our school for a training session when I was 10 or 11. I met him and was blown away.