Thanks Trevor,
I have maaged to get all the old parts out. I used an old engine stud, tapping at 12,6,9 and 3 o'clock, they came out without resorting to any major hammering. The cup on the stem came of with some gentle levering.
The new taper rollers should arrive in the post tomorrow - not sure,but hopefully should be able to use the old cups as drifts to gently tap in the new bearings.
Regards
Duncan