Back online: the retired gas storage site now able to power 1m homes

Rough, a 37-year-old Centrica facility off east Yorkshire, has been reopened to prop up the energy grid

Do you hear that?" asks Chris O'Shea, putting a finger in the air and looking out over a tangle of pipes and workers in orange hi-vis overalls.

A deep whirr punctures the calm of the east Yorkshire coast, as a huge engine powers up and prepares to suck thousands of cubic metres of gas from deep beneath the North Sea.