Thanks for the pointers. Unfortunately, the command you gave me to run doesn't work. I did eventually manage to find a 'show static-route all' option, but there were none set, only the default which I found through 'show config'.
In the end, I rebooted the device from the command line, which left the 3 online controller fighting to become a master, with none of them winning and the wifi becoming unavailable. I finally unplugged all but one which did eventually build a wireless network as master. I then added 2 more back in which joined this network.
I could also verify that I am now able to reach the AAA servers so my 802.1X issue is resolved.
I'm now just left with my 4th AP failing to join the others. It appears to be stuck in a failed firmware upgrade reboot loop. It shows in the list of access points but as disconnected. It also still shows the old firmware version. When I connected directly to the interface of that device, it shows the old firmware is still installed and asks if I want to join a Ruckus cloud. When I prompt it to rejoin the existing network, it fails.
If I ping it's IP address, I see it going through a ping/failing-ping cycle, I.E> apparently rebooting every few minutes or so.