Thanks Martin for all the details and your hard work and encouragement!
I'm still not completely clear about the following point (probably my own fault):
My last "DIY Calendar" event, under the old superceded system, had a 48.8 km (shortest distance) leg to the Calendar start (8am).
48.8km at 14.3 km/hour is 3 hours 24 mins, so I my start time was 04.36 even if I actually started riding later than that. If I started 20 minutes later, I'd lost those 20 minutes.
But now:
Quote from Martin, " ECE times" thread, #6 on February 16 2010:
"all that matters from an ECE POV is completing the overall distance within the maximum time"
I hope this really does mean, in the example above, that I can start at say 05.00, with the overall timing being from 05.00, not 04.36.
(always providing I can reach the calendar controls within the right times of course)
(and yes, it may well turn out not to make any difference to the outcome; but for me at least it does make a significant difference to how "relaxed" the ride can feel)
Sorry to persist about this, thanks Martin, I hope it makes sense, and a one-word answer is plenty!