Theresa May should also resign, but one of the perks of being Prime Minister is that you get to sack the help so easily, and Boris Johnson's position is now completely untenable.
He insisted, repeatedly and publicly, that Porton Down had traced the substance used against the Skripals to Russia. Porton Down now publicly denies that, and points out that such tracing is not its job. He simply has to go.
This is what Iraq would have been like if we had then had social media, and a Leader of the Opposition with at least some understanding of the job title. The war would never have happened. As this war is not now going to happen. How terribly sad for those to whom that realisation will be coming as such a disappointment.