The reality show, which ends its current run tonight, has gained record viewing figures Finding the formula for a successful television franchise might sound just as tricky as finding a winning business proposition, but Lord Sugar, the grizzly eminence at the heart of hit “reality” show The Apprentice , has no need to worry. The current series of his long-running BBC1 programme has beaten all previous viewing figures and Sunday’s final, at 9pm, looks likely to win an audience of about 9