T&G,
I fear the issue of what constitutes a Flying-Related post could be the devil in the detail.
For me, it follows that any post requiring aircrew experience is Flying Related. An Ops job is Flying related but can also be filled by the Ops Spt branch, as can most others when it comes down to it, so you could argue that they don't get Fg Pay so why should a Fly(P)? Does anyone know how this is defined?