But despite his large cash flow and celebrity status, Brand admits he's still struggling to be positive even though he's got everything he ever craved as a young boy.

In Brand's latest documentary, about happiness, he says, "I'm famous now. I didn't used to be but, when I was younger, I always wanted to be famous. I thought it would make me happy. But now I've got fame and some of the things that I thought would make me happy - it ain't worked.

"I don't want to say, 'Lavish sympathy upon me.' I can imagine what people will say, 'Wasn't it as good as you anticipated? Was it when you were single and all the sex and the boozing that was disappointing? Or is it really starting now you are living in a mansion with three cats and Katy Perry? You have suffered.' It's just peculiar to me, a lad growing up in Essex, London, that I would attach such importance to becoming famous and things, and it's not all that good."