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The developments come as campaigners in the UK complain that the government is poised to end grants for commercial users of heat pumps extracting warmth for buildings from sewage farms and industrial plants.

“It’s disgusting, mate. It’s yeast and salt. It looks like road tar. From where I live, coming into Melbourne, I drive by the Vegemite factory every day, and it smells like a sewage farm.”

No one wants to live next to an airport or a power station or a sewage farm, and yet we all fly, we all use electricity, and we all… you take my point.

Experiments on sewage farms have shown also that the upper soil retains most of the bacteria of the sewage.

The writer has seen many sewage farms during the last 18 years, upon which root crops of excellent quality have been grown, and not the least suspicion has ever been raised regarding their use.