Thanks to all, l have been reading some of last years thoughts on clutch & flywheel issues.
The more l read, the more this seems to be a common problem.
I don't really want to go down the route of lightened parts unless they are going to last better and give a better drive (ie less judder).
The one common thought seems to be with regard to the torque ratio. This would seem to ring true as l can let the clutch out at idle and move forward on tickover in traffic then increase revs smoothly, or increase the revs and slip the clutch like mad, both without problems. Yet at mid range it is a problem.
As some other members seem to be thinking, is this down to driver style and clutch control.
In anycase l have two options, suck it and see, or spend loads of cash and possibly still suffer the problem.
KH