The series following the everyday heroes who keep Britain safe goes behind the scenes with the safety teams at the world's busiest runway and the world's busiest shipping lane as they are overrun by holidaymakers.
As festival tented villages the size of towns pop up all over the country, police try to control the crowds.
Plus, when the party's over in Notting Hill, the country's biggest street carnival, an army of workers are left to clean up the mess.
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