re. rear brake:
after bedding in the rear brake on the new ten now works ok. Still not as good as the old drum though.
Took both bikes around the small moto cross track near Cardinham on Bodmin Moor. Here the not so great brakes of the old bike came into their own. Very rough track and steep. Hard to keep the wheels on the new Ten from skidding. One front disc seems to be enough off road.