Physicist Jim Al-Khalili explores the history of the nuclear facility near the village of Seascale in Cumbria, investigating Britain's attempts - past, present and future - to harness the power of the atom. He examines the ways waste and spent fuel rods have been stored there over the past 70 years and looks at the latest attempts to try to clean some of it up, from storage in vast open-air ponds to encasing pieces of old reactors in concrete blocks