The hydrogen home refuelling station works via an electrolyser which produces the gas from water and electricity.

BBC: Hydrogen refuel station unveiled

The fact that the refuelling station uses electricity meant it would not be a much-sought after zero emissions system unless the electricity itself is produced in a more green way, he added.

BBC: Hydrogen refuel station unveiled

Such materials could be used to make hydrogen cartridges that would slot into fuel-cell cars, making refuelling as simple as pulling into a filling station and swapping an empty cartridge for a full one.

ECONOMIST: Space-age soot

Inquiries have got under way after Reactor 1 at the Wylfa nuclear power station on Anglesey was stopped due to a problem with refuelling work.

BBC: The existing Wylfa plant on Anglesey