London's Lea Valley. More secrets revealed

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Covers Brimsdown Power Station; electronic communications; Belling & Lee Ltd, radio and television sets and electronic components; Fuller Electric Ltd, electric motors and electric transformers production; Johnson Matthey Ltd, precious metal refiners; British Oxygen Co Ltd, industrial gases production; Harper Twelvetrees & Son, soap production; Royal Small Arms Factory Enfield, weapons production; Lotus Engineering Co Ltd of Hornsey, motor vehicle production; Carless Capel & Leonard, tar distillers; Keith Blackman Ltd, heating and ventilation business formed by merger of Blackman Ventilating Co Ltd and James Keith