In the years following the Second World War, over one million Britons took up the challenge of a new life in Australia as part of a joint-government subsidised emigration scheme, becoming known Down Under as the "ten pound Poms". But up to a quarter ultimately returned to Britain. Professor Alistair Thomson talks to six migrants - three of whom stayed in Australia and three who returned to Britain -to explore the complex and challenging nature of the migration experience. Producer Michelle Rayner