As WW2 says, the civil service and Downing Street interact in their own ways and with their distinct roles, and the 'should have known' argument is doesn't really hold water . Kemi Badenoch will know that perfectly well.
From what we know and have seen of Starmer I think it v unlikely that he would have deliberately lied to parliament.
The Foreign Office clearly thought that Mandelson could out-smart Trump and I believe he was a success in the role until the Epstein scandal broke.
IMO this is not the moment to try to bring Starmer down and the case for doing so is weak..
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