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Wildlife park opened on the banks of the Thames Estuary

For decades, the capital's waste has been piled onto a landfill site on the north bank of the Thames Estuary.

Now it's being given an overhaul - and transformed into a nature haven for rare birds, bees and reptiles. It will eventually expand to cover 845 acres - around twice the size of Regents Park. Here's Piers Hopkirk.