Stop over thinking it, when I did mine it was two women taking it, both were advanced hgv trainers or somethjng like that.
It was very relaxed and a bit of humour and plain talking was encouraged even though it did have its serious moments.
Just play it by ear, see how the it goes, the "experts" might be knobheads or you could be lucky like me and get two who actually live in the real world.
One of the questions I was asked was why did I speed and my answer was because I thought that it was safe enough at that moment to do so, they were ok with that as it was an honest answer.
The only time I felt they were running to a script was when one guy asked them what they thought was most dangerous, someone doing 5 mph over the limit and paying attention or someone doing 5 mph under the limit and using their phone at the same time, their answer was the speeder to which everyone else disagreed.