I'm pretty certain if the courses had been described as long TD5, medium TD5 etc this thread would have been a lot shorter, and you wouldnt have had to worry about any colour coded guidelines.
As for this:
Grahame N wrote:As to your comment about your son not being up to TAY yellows, what a stupid comment, I'm not the only planner in TAY and every event is different.
I'm not going to take it personally - you're well entitled to have a go although I was attempting to be a little light hearted- but while you are right that every event is different, every "yellow" course should show a lot of similarities and I'm not sure the comments below about using the colours "fairly loosely at local events" would fill me with confidence. Graeme and Greywolf have more or less said the same - and they are both much more experienced than me.