I don’t like the nodding when a studio based news person is handing over to an ‘at the scene reporter. They seem to nod along to every few words before starting to speak.
I've always assumed that the nodding in this scenario is so that the studio person knows the at the scene person can hear them and understand what they're saying.
It's polite in a lecture situation to indicate that you understand the lecturer by giving the occasional nod, especially when s/he has made what you think is a good point.
So it isn't odd at all in parliaments, in my view.