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These devices and services have excited consumers hoping for better insight into their health and lifestyle choices.

Ms Riley called police at 09:11 that morning and her heart stopped at 09:28, with no more movement from her device.

"In a fusion device, typically, the tritium isn't fully burned, and it is hard to come by. So, we wanted to improve the tritium-burn efficiency."

Tapping these discs and plates generates useful voltage that if amplified could be used to charge electronic devices using everyday forces.

Its rival British Gas has come under scrutiny in the past for force-fitting the devices and chasing customers over incorrect bills.