SeanC wrote: but at 90% of events it's TD4 or 5 only, unless you want to do children's courses.
On what data are you basing that figure? Most of my club's local events offer Yellow, Orange, Green and Blue courses with no indication that any are intended for adults or for children. At the last one the breakdown on the Orange was W14/W14/W60/M10/W11/M12/M60/W45/W50/M45/W50/Family/M12/M80/M40/M80/Family/M65