Swinging Arm Bushes

No, the primary will need to come off so clutch as well but gearbox cradle and engine stay put.

Rule number one, always take the oportunity to inspect that which one can see whilst one can, it will give you piece of mind as well as remove the B*gger factor!

I've seen an article on the club site regarding the swinging arm can't remember whereabouts though, sorry.

The blind endplate would stay in the swingarm after the spindle had been pulled from the timing side and the whole swingarm would pull out backwards with the primary in place. However getting it all back together with very restricted access to the driveside of the swingarm would be difficult as a number of parts have to be held in place as the spindle is fed back though. You could give it a try and if it won't go back together then take the primary and clutch off for better access. If you look as the inner face of the inner primary cover you will see evidence of the blind endplate making contact with the inner primary, the iso's movement allows this to happen as the parts are so close. 

You can get the swinging arm out and back in without disturbing the primary drive - no problem.