When I have watched QT in the past they have used differing methods for selecting people to speak. Initially it was very regimented with a list of people. Now Fiona Bruce sometimes just will select the man with the blue jumper etc, it seems to be a mix of pre-selected and random.
Its also no longer questions more like statements from the audience. It felt like Dawn Robinson was making a statment opposed to presenting a question. When I applied for QT a few years ago I had to write my question and was chosen or not partly based on this question. Too often now the audience is allowed to make significant statements, and to me that will lead to more of this "planting" going on. To me you put a question in which is yours but agreed. There should be a wide range of politically neutral style questions.