Wow thanks very much for your answer Lou!  Very helpful, much appreciated.

I find these sorts of flights very difficult to plan in Flight Simulator, because the FSX flight planner doesn't tell you which airways follow which VOR radials and likewise for the intersections. Also, certainly in European airspace (where most of my sim flying is done), airways don't seem to always correspond to VOR radials - unless I just can't find them because of the way the flight planner is set out!

Do you have any advice for planning these routes for FSX - as it isn't clear which VORs and which radials the airways and intersections correspond with?!

Many thanks,
Tom