Ruth finds out how Britain coped with shortages of the wood vital for the war effort in the building of aircraft, ships and rifles, as well as pit props for crucial coal mining. With her daughter Eve, she travels to the New Forest and discovers how women known as 'Lumber Jills' were drafted in to fell trees in the Women's Timber Corps.

Meanwhile, Peter and Alex face up to the wartime petrol crisis. Peter embarks on an ambitious plan to convert a 1930s ambulance to run on coal gas. Alex experiences the conditions faced by the Bevin Boys - conscripts who were sent to coal mines instead of the armed forces because the need for coal was so great. Having converted the ambulance and collected the coal to run it, Peter faces the question: will it work?

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