"On reflection" is a phrase you use when an event has not gone as you expected and you've taken some time to reassess the choices you made leading up to it.
Perhaps you didn't have all the information necessary to make an informed choice.
Perhaps other things happened which you couldn't have forseen or wouldn't realistically have expected to occur.
Perhaps you have reflected on your own biases which led to you making the wrong decision.
So which of these is it, #Sunak? Or do you now accept what we all know: you are completely out of touch in *every* way?