The central problem with a government of national unity is that most of the people whod have to be involved dont want one.
The Liberal Democrats dont want to support a government with Jeremy Corbyn at its head because they believe that it would imperil their chances of winning seats off the Conservatives at the next election, and that Jeremy Corbyn is unfit to be Prime Minister. The Labour leadership dont want to support a government without Jeremy Corbyn at its head because they fear that it would damage them politically, and create a precedent that could be used against Corbyn if Labour are the largest party, or enter government after the next election without a majority. Labour MPs dont want to support a government without Jeremy Corbyn at its head because they fear it will lead to them being deselected, or end their hopes of leading the Labour party permanently after Corbyn has gone.
These groups are in any case divided over what their preferred way of stopping no deal would actually be, and it is not clear that there are enough Conservative MPs to vote for any unity government to make the question anything other than academic.
That does not change simply by suggesting an all-female-reboot for the idea, as Caroline Lucas, the Greens sole MP, has done. But its a clever way to keep the Green party in the headlines by emphasising some of its different credentials. Although the party is not constitutionally obliged to have joint co-leaders, it has had a run of them for close to four years, and its candidate for the London mayoralty, many of its most highly-rated MEPs, its sole member of the House of Lords (and, Im told, its second member of the House of Lords, nominated by Theresa May in her resignation honours but not yet officially cleared by the new regime) are all women.
The idea reflects an underrated element of Lucas political skillset: keeping her party in the headlines through eyecatching measures – a tax on meat was one, and this was another – that reiterate the partys key messages.
That fact would be a source of considerable solace to me if I worked in Downing Street, and a subject of great worry if I worked in Jeremy Corbyns office. The nightmare scenario for Boris Johnson is that while the headline voting intention shows an opposition divided between Labour, the Liberal Democrats and the Greens, tactical voting means that he loses seats to the Liberal Democrats in England and Wales, fails to make a breakthrough against Labour, and in addition is whomped in Scotland by the SNP.
That is less likely to happen if the Green party remains in the news and continues to be seen as viable entity, not just in safe seats where the outcome is up for grabs, but in marginal constituencies.