Fly over the Giant's Causeway as jet-ski litter pickers tidy up the coast. Gardeners wield chainsaws while hanging from the Eden Project roof, and a view of the London skyline as one of the city's tallest skyscrapers gets a spring clean.
Michael's journey through the home counties continues at Woking, Surrey, where he uncovers the story of Britain's first purpose-built crematorium, a response to overcrowded cemeteries and London's ever-expanding population.
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