Originally Posted by Ceri JC

Some questions:

Am I right in thinking I should be revving reasonably hard and then easing off the throttle a split second before changing up?

Yes, you need to be accelerating fairly hard for a clutchless change to be effective. Close the throttle just enought to take the load off the gear box and it should just slip into next gear, close throttle to much and the dogs in the gear box crash back together, dont close enough and there will still be a load on the gear box, thus causing excessive wear and tear.

Also, how far should I close the throttle, it seems to be smoother when I just roll off a bit, rather than close the throttle entirely, is this right?
Close the throttle just enought to take the load off the gear box and it should just slip into next gear, close throttle to much and the dogs in the gear box crash back together, dont close enough and there will still be a load on the gear box, thus causing excessive wear and tear.

Are you only meant to clutchless upshift in higher gears and at very high revs (it seems the deeper into the powerband I go, the smoother the upshift)? I was under the impression it could be done in any gear.
Your impression is right. You can clutchless change at any gear at any speed, its all a question of timing. If the timing on throttle closing, and gear selection is good, and you've closed the throttle the correct amount, the gear will go straight in.