In episode four, ‘Joanna Lumley's Postcards: Greek Islands', Joanna gives a personal insight into her odyssey across the Greek archipelago. Having - mistakenly - travelled to Poros as a young model, Joanna revisits the landscape that sparked her love affair with the Greek Islands.Aboard the 'Christianne B', Joanna learns from her host - shipping magnate Captain Sarkos - why the sea is so vital to the Greek people. On the island of Evia, the villagers of Antia engage Joanna in whistled conversation, and on Kos, we discover how Hippocrates' holistic vision of healing shaped the way ancient hospitals were built.