Arsebuscuits, I fucked up the practical exercise. 99% chance I've failed. They don't tell you straight away because they're afraid of getting punched, but he started being a right twat with me to the point I wanted to punch him, and I'm not like that at all.
Before we started he asked us all about our background when I told him I'd been in IT. I think he was putting me under pressure on purpose because he decided he didn't like me. After his first pisstake I mentioned I was disabled through anxiety and PTSD and he actually got worse. No wonder they're worried about getting punched if that's the way they act. Ho hum. It's not his fault I started losing the plot, but he certainly made sure I was totally out to lunch by the end.
The theory was easy, however.