In the first programme, Ray travels to the other side of the planet to hear from Australian Aboriginals about what food means to a hunter-gatherer and the role it plays in their culture as well as their society. Along with many other discoveries, the trip sees Ray sample that most iconic of "bush tucker": the witchetty grub, a huge maggot that lives in the roots of the witchetty bush.

Ray and Professor Gordon Hillman, an expert in the use of plants through the ages, look at the marshes and waterways which our ancestors used for travelling and as an abundant source of food.

Summer Harvest shows that our ancestors would have had access to a wide variety of plant foods, but meat would have been the staple in their diet.

For our ancestors, Autumn would have been the last chance to gather food before winter stole much of it away. Ray travels to the island of Colonsay in Scotland to investigate