Lords Bridge, located near Cottenham was Maintenance Unit No. 95. It was a Forward Filling Depot with two 250-tonne mustard gas storage pots and stocks of chemical weapons. In 1955, one of the pots exploded, vaporising 20 tonnes of mustard gas; a cloud of toxic black smoke spread over the countryside. The pots were finally removed in the 1980s. Today the site houses a pumping station for the Anglian Water Company and Cambridge University’s Mullard Radio Astronomy Observatory.

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