Well it seems V8 is out on the UK site.
I installed it, reset to factory defaults, configured my two ST3500320AS drives for RAID1, did a scan disk, and have the following issues:
Volume Name: Volume_1
Volume Type: Standard
Total Hard Drive Capacity: -1 MB
Used Space: 0 KB
Unused Space: 0 MB
Plus can't resolve by device name e.g. \\nas.
... just hard booted and all seems OK.
I'm going to try the process above but with hard boots in between to make sure all is well.
Fills me with confidence. Not.
Tried again and for the second time after running the wizard and chaning the address details I get a popup blocked message. Then I wait and access the new address and login and get a page cannot be displayed message. Then I have no access to the NAS either via it's new IP address or name. Nor by it's old details. 5 minutes later I have access?
After numerous hard boots and resets all seem stable. Not sure if it was the lack of hard boots or the scandisk that caused it.