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One question we'll be asking is how young Ukrainians - people who were born around the time of the explosion - feel about the disaster, and how they feel about nuclear power. Ukraine is currently building two new nuclear reactors and around half of the country's electricity comes from nuclear power.

But we'll also be talking to Ukrainians gathering at an exhibit in London to mark the anniversary, including hopefully Ukraine's ambassador to the UK, to find out how they remember the explosion and its aftermath, and how the country is coping with the fallout 20 years on.