That would be Tom Williams who's now UK Country Manager for parkrun.
As regards Derby, if you build it, they will come
I'd suggest contacting the local running clubs and you'll probably come up with a few core volunteers who are actually experienced at organising races.
I'd also strongly recommend you try to design a route where course directions can be covered by signs rather than marshalls - that way you need a lot less volunteers, and the runners get used to finding their own way. If you have marshalls and one week you're short of volunteers and have marshalls missing you'll be amazed how many people will get lost because they're so used to being told when to turn they've never bothered to actually pay attention to the route. We have no marshalls at all on our course, just signs, and as a result we can comfortably handle 300+ runners each week with just 7 or 8 volunteers, and could probably get away with as few as 5. Finding 7 or 8 has never been a problem, but I suspect finding 15 or 16 per week as we would have to if we had marshals would be much more difficult, particularly when we were starting up.
Edited: 11/01/2012 at 13:51