Undo the lower shock bolt and hang off the hub and you can pretty much drop the springs in 
Not in my experience you can't. Having changed umpteen sets of rear springs on my Elites over the years, yes, I agree, undo the lower shock mounting, but you also need to disconnect the rear track control arm (I find it simpler at the inboard end) to allow the swinging arm to drop further. Even so, the springs have to be compressed to allow removal and refitting, but due to the lack of space to fit spring compressors, this is a challenge. There's no room to fit the large compressors with plates, so you have to resort to using the smaller hook type.
I would argue there is no way of removing the spring by just undoing the lower shock mount and levering the swing arm down, which isn't helped with the protrusion of the spring seat down the centre of the spring.