Fair play, and respect that you walk it like you talk it , - I wont ask how much (or if he was worth it

)
I would make one more general observation - not aimed at you or tony in particular
a volunteer or intern who is working free is usually covered by the 'employees' liability insurance of the placement owner - however a contractor is usually expected to have their own liability insurance - so if Tog X takes wannabe assistant Y along to a wedding as a subcontractor where do they stand on insurance ? So if the assistant causes an accident and guest later sues the togs insurer may well deny liability, and pass it on to the assistant who might well be uninsured.
This is equally an issue for someone who takes a volunteer/intern on without checking that they have ELI in addition to PLI - except that in the latter case both may wind up collectively liable and without cover