Good man, Nick!
You beat me to it - what a lot of inconsiderate tossers! My own first attempt at R/T in front of an examiner nearly twenty years ago (it was done separately across a table that time!) was a dismal failure, redeemed only after I'd had a stiff talking to by an instructor and spent some time talking out loud to myself in what my family thought was a very strange language indeed as I carried out circuits of the sofa in the sitting room!!
After a little while, you obviously get to know what to expect, broadly to know what you can expect to be told and how you're going to be told to do it and, obviously, what you ought to say in response.
Heli-Ben, enjoy your flight!!