Hi,
Thanks for taking the time to help 
df -h shows disk usage is ok (don't know why it insists on a table?)
| Filesystem | Size Used Avail Use% Mounted on |
/dev/mapper/vg_divss029-lv_root
| 30G 4.3G 24G 16% / | |
| tmpfs | 3.9G 56K 3.9G 1% /dev/shm |
| /dev/sda1 | 485M 95M 365M 21% /boot |
Rabbirmq queues look ok
Listing queues ...
celery 0
zenoss.queues.zep.modelchange 0
zenoss.queues.zep.signal 0
zenoss.queues.zep.migrated.summary 0
zenoss.queues.zep.rawevents 0
zenoss.queues.zep.heartbeats 0
zenoss.queues.zep.zenevents 0
DIVSS029.celeryd.pidbox 0
zenoss.queues.zep.migrated.archive 0
...done.
I did find that a Python process was using 99% CPU this morning, I didn't think to look in Zenoss -> Advanced -> Daemons to see what if anything matched that PID brfore I killed it, but i suspect it's Zenhub. After I killed the process i had a look a look at Daemons and saw Zenhub was down.
I'm having a look at the logs and will post what I don't understand soon.
Regards
Wayne