If it's a 20 minute air ex flight, ie, Bloggs gets in, Bloggs flys for 20 mins, Bloggs gets out, sounds like anyone with a JAR-PPL(TMG) or NPPL(SLMG) rating could do this, as long as they are not accepting renumeration for said flying (and are suitably insured for the risk, perhaps!?) - after all, they're not instructing, but taking Bloggs for a 20 min jolly. I'm sure one of these guys would snap up the free flying!
I would have your arm off, however do not hold a PPL(TMG) or NPPL(SLMG) as yet, only an Air Cadet's Instructor Rating
Which reminds me, does anyone know (apart from OSF) where's good to convert Vigilant hours to PPL(TMG)