Okay, thanks for the information and the links, people. I think I have enough to come up with a proposal or not.
Turboprop, Riverrock, this charity operates over 15 events annually, each on a different airfield. A mix of controlled and uncontrolled, and airfields with and without the hi-viz requirement. Between 25 and 125 sick and handicapped children per event, plus their family. We're trying to find a solution that covers all situations.
Obviously the high-viz is not the only safety measure we have. The passenger brief is standard, there's a strict limitation on who is allowed airside, we have dedicated people who know the airside dangers and they are the only ones bringing passengers to and from aircraft, we have extra fencing to separate airside with landside, and so on and so forth.
In fact our safety measures are such that we are essentially writing the rulebook. We don't have to negotiate with each field, we just follow our own rules as they typically are better suited, more consistent and more uniformly adhered to than the airfield rules. And deliver higher safety.
----------------------------------------------------------------
So, let the ridicule of the hi-viz vests begin. Dirkdj and Purple Pitot have already started. Bonus points for the first to post that picture of the guy in the Freddy Mercury-style day glo swimsuit (or what is it?)
(Although with a name like Purple Pitot I think you've just disqualified yourself from ridiculing high-viz vests...

)