Turn Notifications Missing in TCX (best for Garmin)

I've been using cycle.travel for some time and think it is really excellent especially given that it is free. I have always chosen the tcx format for downloading routes to my Garmin Edge 1000, choosing the one that says it is best for Garmins. It works perfectly well except the turn notification doesn't seem to be working. I usually change the default 30m to 100m, save, export, import etc and when I ride the route I don't get any notification - actually maybe 5m after the turn. Am I doing something wrong?

Thanks

Woodbury Circuit

Pretty lanes, only a small amount of busier road. Lots of cycle paths past Topsham, Exeter, Cranbrook and Ottery St Mary.