Jeremy Corbyn has now recorded a clip for broadcasters about Boris Johnson’s Porton Down claims. He said Johnson had “egg on his face” because his claims were not backed up by evidence. He told Sky News:

Boris Johnson has serious questions to answer. He claimed on German television that this was a Russian-produced nerve agent and Porton Down then examined it and said all they could identify it was as novichok. They couldn’t say where it came from, and the chemical weapons organisation is meeting to continue that discussion about where it goes from here. The Foreign Office then issued a tweet in support of what the foreign secretary said, and then removed that yesterday after Porton Down had said they couldn’t identify the source of it.

So Boris Johnson seems to have completely exceeded the information that he had been given and told the world in categorical terms what he believed had happened. And it’s not backed up by the evidence he claimed to have got from Porton Down in the first place. Boris Johnson needs to answer some questions …

Where does that leave the foreign secretary? Egg on his face for the statement he made on German television…