Fiona Bruce presents the show from Brodie Castle in Moray, and meets a family of bagpipe makers. Treasures include a cane with a concealed compass and telescope, an engraved silver salver awarded to a local engineer, a pair of rare 18th-century silk shoes, and a watch that saved someone's life. Plus, the story of a sheep that changed science's understanding of genetics

The author and adventurer continues his Australian journey in Kakadu, the country's largest national park, where he works through the night with a team committed to culling the poisonous feral cane toads that are threatening the region's wildlife. He then learns how to survive off the land using ancient Aboriginal knowledge as he heads out on patrol with a unique military unit in the remote northern Bush, before attempting to catch box jellyfish on Cape York Peninsula with a group of scientists who believe the species' deadly venom may have medicinal qualities. Finally, Simon flies 100 miles out over the ocean to watch a large tanker being guided through the Great Barrier Reef

Michael Portillo ventures Down Under to explore Australia by train. He begins by riding the legendary Ghan Railway, a train almost a kilometre in length and hauled by two locomotives, which covers nearly 2,000 miles across Australia's red centre. Michael traces its route from the southern harbour of Port Augusta to Darwin on the north coast, along the way meeting the indigenous people of Alice Springs, visiting a kangaroo sanctuary and joining Australians to mark the anniversary of Anzac Day, the First Word War battle that defined their nation

A look at the challenge of preserving unspoilt wildernesses, from the icy expanses of Siberia to the tropical forests of central and South America. Simon reflects on how his past series have dealt with the causes and impact of climate change, as well as remembering a memorable report exposing the extent of plastic pollution in the ocean. He also recalls meeting indigenous people around the world and hearing their first-hand experiences of ecological damage

It's the pursuit of cute as the team re-commission a 1991 Nissan Figaro

The team take on one of their most ambitious projects to date - a 1963 Lotus Elan Series 1. Their second project - a 90's BMW 3 series