Shipping gets a mention in the UK’s Hydrogen Plan for £4bn ($5.5bn) of investment in the fuel by 2030, which builds on a wider 10-point £12bn strategy for a green industrial revolution that the government launched last year.

But it is literally one mention in the announcement, with the biggest single investment of up to £20m in the Clean Maritime Demonstration Programme to develop green shipping technology already the only major element in last November’s plans.