Ah now you just can't beat Service writing, or is it Defence writing now? Or has it really all been cancelled? Who knows.
Anyway, bored as I am I thought I'd try to lend a helping hand HighTow. 'Supernumerary' at least in the sphere of the RAF in which I work is generally used to mean 'You're there in an official capacity but not exactly required'. ie Supernumerary Crew on a Herc, for example, count as crew rather than pax but aren't involved in making the turny things turn or the flappy things flap or indeed the pax behave.
I'd suggest he was posted in to No. 5 GTS as a Flt Sgt without portfolio, but then that just raises another RAF term you may not understand.....
