And.......
1- don't forget the MAYDAY "relay" they'll throw at you to make sure you know the correct format.
2 - The Pan THEY instigate the timing of, so prepare what you're going to say (except position,alt, heading etc) in the 15 mins preparation time. and don't forget QE2 (Qualifications, Endurance and no. of people on board)
3 If the brief says do ALL position reports on the route - work most of them out in the prep time.
Use the 15 minutes wisely and you can just read the bulk of it back without panicking.
Just done my second practise route and I'm now using the prep time to set up blank formats for all of the above so I just grab the appropriate piece of paper when the time comes - makes things a lot easier!!!
Mind you... I'm still in the circuit, so don't have your experience of the outside world - so you'll probably cruise it.