The tallest concrete structure ever demolished in Britain came crashing down in Kent. At 800 feet, the Isle of Grain Power Station chimney was taller than Canary Wharf. And more than twice the height of Big Ben. It dominated the Medway skyline for 36 years - and disappeared in ten seconds. In Nashreen Issa's report we hear from plant manager Bill Cliff, two former employees and the local MP Kelly Tolhurst.