And in the process, we have come up with fuels - algae-based fuels, isobutanol-based fuels and other fuels - that we think will power the planes in the future so that, you know, by 2020 I hope that our planes will be powered on fuels that are clean fuels and are not polluting the environment so that we'll have a green airline and an airline that actually has fuels that will be hopefully cheaper than the dirty fuels of the past. So [we're] doing good and also turning a profit at the same time.

By working hard, by making the right moves, you can create your own luck, I think. But certainly luck plays a part.

Fun is at the core of the way I like to do business and it has been key to everything I've done from the outset. More than any other element, fun is the secret of Virgin's success. I am aware that the ideas of business as being fun and creative goes right against the grain of convention, and it's certainly not how the they teach it at some of those business schools, where business means hard grind and lots of 'discounted cash flows' and net' present values'.

Free publicity and word of mouth is probably the best and cheapest form of advertising. Learn to use it to your advantage.

Quality brands never go bankrupt.

I never learned the rules in the first place. To change the game is at the heart of what Virgin stands for, so the company culture has always been: "Don't sweat it: rules were meant to be broken."

Happiness is the secret ingredient for successful businesses. If you have a happy company it will be invincible.