Westminster Hall is an alternative Chamber for MPs to hold debates, named after the adjoining Westminster Hall.
Each debate is chaired by an MP from the Panel of Chairs, rather than the Speaker or Deputy Speaker. A Government Minister will give the final speech, and no votes may be called on the debate topic.
This information is provided by Parallel Parliament and does not comprise part of the offical record
It seems to me that that is a matter for debate, not for the Chair.