Dr Mark Porter investigates a new shingles vaccine for the over 70s. Is a chicken pox vaccine for children an alternative? And contraception for the over 35s: can you take the pill until the menopause? Mark Porter finds out why we're so poor at First Aid. And if you're switching to cheaper drugs, does the size and colour influence how you take your medicine. Could changing to a cheaper brand have a hidden cost? And early clues to Parkinson's disease.