In the fourth episode, Sian Williams investigates what makes chocolate so irresistible and gets the public tucking into the Cadbury's bar which contains 30 per cent less sugar to see if it's as tasty as the original. The programme is halfway through its 28-day value for money road test and tonight two more diets are put through their paces lb for £. Under the microscope are The Meal Prepping for Weight-Loss Diet, in which calorie counted meals are all prepared in advance, and The Diabetes Weight-Loss cookbook, road-tested by 44-year-old Sharon who is borderline Type 2 Diabetic.With impressive weight loss results from both diets, how will they rank on the programme's Save Money lb for £ leaderboard?