An anaerobic digester has also been built on the farm as an alternative way of generating income from waste.

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The anaerobic digester would have used 10, 000 tonnes of locally-grown maize to produce methane gas to convert into electricity.

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Prince Charles visited the anaerobic digester and biomethane plant in Martinstown, near Dorchester, after opening a ward at the town's hospital.

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First, the hog waste is placed in an anaerobic digester, which contains bacteria that consume the manure and release methane gas.

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It is also developing an anaerobic digester that acts like a giant cow stomach, creating biogas from solid food and plant waste.

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In an off-grid village in India, for example, biogas from an anaerobic digester could be burned to drive the Stirling engine to generate power.

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We design and manufacturer something called an anaerobic digester.

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The authority said at the time its challenge was not undertaken lightly because it believed the anaerobic digester was the first on this scale to be approved in any UK national park under farm diversification policies.

BBC: The Jones family from Talgarth, near Brecon