look a bit astonished by that number, but consider for a moment the incredible diversity of mental illnesses, from autism and intellectual disability in childhood, through to depression and anxiety, substance misuse and psychosis in adulthood, all the way through to dementia in old age, and I'm pretty sure that each and every one us present here today can think of at least one person, at least one person, who's affected by mental illness in our most intimate social networks.