viable

Consumers might also have to readjust in terms of accepting that artificially low prices won't be viable for some products.

However, for this technology to be commercially viable, scientists need to tackle the challenge of improving both the stability and efficiency, especially around the lead-tin perovskite cell used in this design.

The newly appointed Border Security Commander, Martin Hewitt, has told us: “We will keep chipping away and undermining their business to the point where that is no longer viable and profitable.”

He said the city’s funding withdrawal led him to believe the project was not financially viable, a claim the developers disputed.

"We will keep chipping away and undermining their business to the point where that is no longer viable and no longer profitable," he told the BBC.