Stephen Sackur talks to newsmakers and personalities from across the globe. It is a year since the credit crunch first rocked financial markets, and the cracks in the global economy are getting wider. Borrowing money is harder, commodity prices are soaring and the United States could yet lead the world into recession. Anthony Bolton is the UK's most consistently successful investment fund manager of the last 30 years. Stock markets are already in bear territory; just how bad could it get?