Bruce Langridge chats to Bob Edwards about the fun he's had volunteering in the Apothecary's Hall at the National Botanic Garden of Wales. We hear about the creative ways he's used the collections from old chemist shops to grab the interest of Garden visitors, be it through the poisons used in Agatha Christie novels, Harry Potter's mandrake, blood sucking leeches, the scent of frankincense, the vomit of whales or the soothing effect of asthma cigarettes. Bob even plays us a parting tune.