Mr Johnson will talk with pride about the vaccines programme and argue the UK emerged the final lockdown earlier than other comparable economies.
Those around Mr Johnson are letting it be known the broad tenor and scope of the arguments he is expected to make, before what could be up to ten hours of questioning from lawyers.
His former director of communications, Lee Cain, said the pandemic was the "wrong crisis" for Mr Johnson's "skill set", describing dither and delay.
And his former chief adviser, Dominic Cummings, has long described the former prime minister as "the trolley" due to his tendency to veer around and constantly change his mind.
He will also defend his use of colourful language and phrases, and the adoption of provocative positions in private - saying it helped him get the best out of his advisers and it is not wise for a prime minister to sit in silence when being briefed by experts.
The former health secretary, Matt Hancock, has revealed in his written statement to the inquiry that "the then prime minister has apologised to me for appointing his chief adviser and for the damage he did to the response to Covid-19".
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