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.