Why do a growing number of people today believe the century they’re living in is making them sick? Sarah is from London. She claims she suffers such strong allergic responses to electrical appliances and mobile phones that she’s moving out of the capital. Will a house in the country stop her getting zapped? Andy says he’s allergic to everyday household chemicals including hairspray and fabric conditioners. His illness has made his family life so difficult that his relationship is now in the balance. Gillian claims to have such extreme sensitivities that in the last 11 years she has not been further than the end of her garden lane. Although conventional medicine may be against them, these people insist they are ‘human canaries’ alerting us to the hidden dangers of how we all live today. We once thought cigarettes and asbestos weren’t doing us any harm - could we be wrong again?