It’s like any other interview, so preparation is key. They have 3 or 4 questions on each sheet and only choose one, so you may not get the same questions as me. It’s important to answer in a way that reflects what you’re being interviewed for - seems obvious, but what I mean is if you’re describing your current role, talk about aspects that share similar driver attributes, such as safety, lone working, attention, vigilance etc.
If you remain calm, have good memory recall (can remember back to past incidents that could answer their questions), then you should be ok.
I believe at this stage, they’re looking to see if you’re not suitable, rather than if you are. By which I mean, they already know a lot about you and that you are able to pass psychometric assessments, but are you a good communicator, are you presentable, do you tend to say the right things, would you be the type of person they want working at GWR.
It‘s about all I can say really. Most has already been said on here before. You should be fine if you perform well on the day.
Oh, and arrive early. They know you’re there early and they like that.