Autumn colour: The science of nature's spectacle

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This year was recently described as having the strangest weather on record in the UK, from droughts to a dull and rain-sodden summer.

But there could be a ray of light at the end of the murky tunnel.

The Forestry Commission says the elements have conspired to give us a particularly spectacular display of autumn colour.

Here, Raef Johnson from the National Arboretum in Westonbirt, Gloucestershire, explains how different species of tree put on their seasonal show.

Video journalist: John Galliver

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