This should be interesting
Ahead of his appearance, Mr Cummings has tweeted a picture of what he says was a whiteboard shown to the prime minister on 14 March, with a suggested “plan B” for handling the pandemic.
The picture appears to show an estimate that “plan A” – the government’s initial strategy of mitigating but not supressing the peak of the pandemic – would lead to 4,000 deaths a day.
It adds that under "plan B," the government would be "more aggressive" in suppressing the virus the following week, with a "full lockdown" implemented before a "collapse" in the NHS.
Science and Technology Committee chair Greg Clark starts by asking about Dominic Cummings' blog from March 2019 explained the risks of viruses in labs in Asia being able to kill people. He asks if, when China was sealing off its country, Mr Cummings was "alarmed".
Mr Cummings says "senior ministers, senior officials, senior advisers like me fell disastrously short" of what the "public expects during a crisis like this".
He says he is sorry for the "mistakes that were made" for those who have lost loved ones during the pandemic.
When it started in January 2020, "I did think, oh my goodness, is this it? Is this what people have been warning about all this time?" but he says the WHO and in other health organisations across the world, alarm bells were not ringing.
"I think it's obvious that many, many organisations failed," he says the Taiwanese government closed the borders and enacted a plan on New Years' Eve.
"The western world, including Britain, completely failed to see through the smoke."
He says he asked Matt Hanrooster where the country was in terms of scanning for the virus, resource operations planning for a pandemic on 25 January 2020.
Continuing, Cummings says he would also like to apologise for the fact he did not "follow up" and "push" on his initial concerns about the coronavirus in January.
He says people in Downing Street were told at the time that a pandemic had been repeatedly planned for and "everyone knows what to do".
He adds that it is "sort of tragic in a way" that although he was running teams to question received wisdom - red teams - on other topics, he did not do it in this area.
He says if he had, the government would have "figured out much earlier" that claims of great preparations being made were "completely hollow".
Cummings tells MPs he first raised coronavirus with the PM in the first half of January last year, but there was not “any sense of urgency" about the pandemic until the last week of February.
He adds that “lots of key people were literally skiing" during the middle of February.
He says that looking back, he “should have been hitting the panic button much in February than I was".
Cummings continues, "the government itself, and Number 10, were not on a war footing with this" until the end of February.
He says he "spent more and more" of his time dealing with the pandemic in February while the prime minister was on holiday.
"After the 30th January, it was not at all seen that there was going to be a pandemic," he states.
In January and February, he says he was "working very much on the science and technology agenda" and he spent a lot of time "trying to get to grips with the procurement system" which he describes as a "nightmare".