The consumer series is back, road testing what works and what is just an expensive rip off - from everyday medicine cabinet staples through to the more embarrassing health buys. Journalist Sian Williams and Dr Ranj Singh get to the bottom of the true cost of some of the nation's biggest health spends, from sleep to pain to allergies and diets. Sian and Dr Ranj look into Britain's medicine cabinet each week to find out how to save money on what is inside. The UK's most popular diets are put to the test - which one will be crowned best value for money?