As long as you've got slightly more perception than the average wrapped loaf, you could invent something.

The key to success is to risk thinking unconventional thoughts. Convention is the enemy of progress.

But having had your bright, fresh, original idea, the really hard part is turning it into a successful product. That's what takes all the sweat.

All inventors, they say, are a little mad. I reckon that only completely sane people are willing to admit they are slightly crazy.

But there is only one person I blame for getting shafted, and that's myself. I went into the deal which I thought would secure the future of Orange Aids with culpable impetuosity. I had been used to doing business on a handshake and my work of honour, and I made the error of actually believing what the men in the pin-striped suits told me.

The notion that inventors are anorak-wearing crackpots with glasses held together with Sellotape is beguiling but wrong.

That was the Alka-Seltzer moment, the moment when the tablet hits the water and begins to fizz.