The accusation is not that the delay was to allow Johnson to go, it was to preserve the opportunity for him to visit without looking like he was travelling in a manner his government was banning. Why is he not banged up in a hotel for 10 days like every other red list visitor? The dominant virus that has forced a further month on lockdown restrictions came into the UK during that period. I guess that will be another thing that will have to wait for the public enquiry, whenever that takes place!