Alistair McGowan looks at the legends of the green baize who helped make snooker both a national obsession and a TV phenomenon, uncovering interviews with players who set new standards in the game. He takes viewers from the explosion of characters and colour in the 1970s and the dominance of Steve Davis and Stephen Hendry to the famous black-ball final of 1985 between Davis and Dennis Taylor - a game that shattered nerves and TV viewing figures