It looks as if the composition of the select committee may be irrelevant, if Newsnight's report is correct: they suggest there is an intention to amend Labour's motion to essentially remove all reference to having the committee investigate whether Johnson misled the house, but instead to comment on Ukraine and/or the cost of living.

It looks like we are reliant on the speaker to decide if such an amendment should be selected.   However, as we have yet to see either the motion or any suggested amendments, we may be getting ahead of ourselves.