Having the chair of that association to lunch is a good idea. It's a good courtesy.
To the other point, I don't see any difficulty if we want to add somebody to discuss the union perspective. But I wouldn't want to take an already prepared part of the agenda out of there. It's okay if it's a matter of adding a few minutes or whatever at the end. These are all fairly restricted times, so I don't think it would be a problem if we wanted to add a bit of time there. I would rather not take anybody out of the agenda who's already there.