"Nudge, nudge, wink, wink, interest you in a cheap watch, guv?" That's the traditional image of fakes, the way it used to be, the spiv with his coat lined with counterfeits. But things have changed. These days there is nothing that's not being faked; films, fashion, spare parts, drugs, tea bags, cigarettes, even toothpaste. You name it, someone somewhere will be knocking it off.