Ok, We managed to open a ticket with support on this issue and unless you have premium support this doesn't look like it'll be fixed anytime soon.
So just a heads-up to anyone looking at a new Gen8 HP server with the new 400 and I'm guessing 800 series RAID controllers.
It appears to be triggering events on drive failures etc. so at least we'll know if a drive fails, but we have no way of being able to manage other than having to break the HA and boot a node into the HP provisioning tools.
Please remove hpacu from the server and install/use hpssacli. It only means that the raid was configured using the latest smart storage administrator instead of the older array configuration utility. You can get the hpssa from the supporr site.
This issue is seen when the raid is configured using the latest intelligent provisioning which has smart storage administrator inbuilt.