Mazzy - and other potential QXCs here...
During my QXC I hadn't planned anything specific to say in the 'pass your message' but found myself saying:
PA28
1 P.O.B.
Student PPL on Qualifying Cross Country.
etc..
When I arrived at Tatenhill I met the controller in the cafe having a break. She said that she had made a note of the fact that I was on QXC and so paid more attention than normal to ensure that I would be monitored and also to listen in to my R/T skills.
On reflection I did find that all the controllers I spoke to had been more 'gentle' than usual. Note that the Waddington controller had left me alone and that East Midlands had dispatched me early to Tatenhill, and had also left me to my own devices en-route to Sandtoft.
This might be wishful thinking on my part (and someone will no doubt come along in a minute to confirm this), but perhaps stating the fact that I was QXCing did make a difference to the controllers.
Worth bearing in mind.
Kookabat - a 3 month plan for a nav trip? That must be the most meticulous planned trip ever! Some of the moon shots in the 60's probably didn't get that much attention between launches