In reply to Jeromecooper:
Alrite mate,
Sub-cniefon rib into cniefon arête I think is a bit more natural, and complement each other well.
Idwal Slabs, then carry on up the two tiers above, grassy scramble rightward over to glyder fawr and go up central arête. Nothing above severe and some great views and fantastic positions. Could descend down bristly ridge to top it all off.