I had mine a few weeks ago and found out yesterday I'd passed.
I had a notepad with the Purpose, Values, and Mission written in it, as well as some current ScotRail campaigns in case I wanted/needed to refer to them. I also knew the rolling stock/traction used on the line, and where the line went (more-or-less a single line at my depot, so this was straight forward).
I had also written down challenges that other drivers found with the job, and a couple of fatigue management tools, which was definitely handy.
I just turned up one day and asked at the ticket office if any drivers were about who'd have a spare 10 minutes to chat about an upcoming interview. They phoned down to the driver room and sent me down. There were only a couple about and they both had trains to get in ~10 minutes, but still gave me 5 minutes of their time, answered my questions, and gave me a few very helpful pointers.
Was good to refer to it in the interview.