The well was drilled but never fracked - leaving the site owners, Third Energy, with a deep hole in the ground.

Tom Heap with Steve Mason and Russell Hoare at the once highly-contested proposed fracking site Its managing director, Russell Hoare, showed me the well and explained its second life. They are even re-using the two metre-high gas valve which caps the hole.

"This is the actual well that was drilled for fracking and it’s about 3,000 metres deep, but the protesters were successful, and Steve was successful, in stopping that operation.

“But it’s perfect for testing geothermal energy. There’s hot water at the bottom. All we’re doing is bringing it to the surface.”

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Once commercially exploited, they reckon this well could supply 300 homes, so we would need a lot more deep drilling to keep Britain warm.

Gas to geothermal conversion company, CeraPhi, thinks there are 680 wells in the UK ripe for conversion together with millions around the world, and that new wells can be sunk cheaply enough to expand further.

Such potential provokes interest. While we are on the site, chief executive Karl Farrow is showing around a group of academics and industry players.

They’ve had more than 100 such visitors in the past month.

Karl told me: "Wells at the end of life can be repurposed and reused for energy.