Approximately 850,000 people in the UK today are living with dementia – and that number is just set to grow. But what actually is dementia? What does it do to us? And what does it say about us, and in particular about our humanity?

In the third episode of Reading Our Times, Nick Spencer talks to novelist and journalist Nicci Gerrard about her experience of her father’s dementia and the moving and poignant book she wrote about it, 'What Dementia Teaches Us About Love'.