Thanks Andrew.
The gpxx files used in 'follow-road' setting result in what is essentially a sat-nav on the bike, with turns flashed up however many metres in advance, with a zoom-in of the junction if required, and not restricted to the 100 waypoint limit. Hardpoints in the route become 'via' points.
What I'm after though is trying to find if I can manually enter some kind of other point that will flash up on screen when reached. Bikehike allows you to add POI or coursepoint, and there seemed to be a dialogue box to name it... presumably with something that would flash up on screen. Problem is, coursepoints are only downloaded in TCX files and in GPX track and route files at the moment on bikehike and not gpxx.