The entrepreneurs who succeed usually want to make a difference to people’s lives, not just their own bank balances.

And [we hope to sell] the clean fuels to other airlines. I mean, the exciting thing about the breakthrough with clean fuels for the airline industry is there's only 1,700 pumps in the world that fill up the airlines.

Space is hard - but worth it. We will persevere and move forward together.

I've been taught not to have any regrets. If we were to add up all of the hours spent regretting mistakes and use that time to develop new ideas, who knows how many brilliant new businesses would be created.

Listen to the customer's complaint and act fast.

I never get the accountants in before I start up a business. It's done on gut feeling, especially if I can see that they are taking the mickey out of the consumer.

The Earth cannot wait 60 years. I want a future for my children and my children's children. The clock is ticking.