One test for a new Labour government within a couple of months of the election is whether it can persuade Tata to keep blast furnace number four at Port Talbot in operation instead of closing it in September as intended, given Labour's manifesto commitment to invest £2.5 billion in the steel industry.
The trouble is that Labour are committed to making the UK "a world leader in clean green steel with a long-term programme of investment in clean steel technologies". But the blast furnace is old, very un-green technology. However, Tata does intend to build a new electric arc furnace on the site with government help, but that will take around three years.
Can Labour afford to pay Tata to keep one blast furnace operational as well as funding clean steel technologies?
Edited for typo