After an accidental power outage the whole network dropped off.
Looking at the 10 gig switch I got the dryatek had decided to issue 192.168.0.200 address to the switch event though that server is disabled. IP address to default wan ports were being issued with the correct ip range.
No reboots of the switch or using a manual ip address worked.
Finally on the 3rd reboot of the 3910 the switch finally got the correct ip address issued.
However ipv6 is now broken on normal lan ports and on the spf port.
I've got a backup config file so I'll reset the damn thing to defaults and then load the backup cfg after I finished in the garden tomorrow.
I may have to do a tftp of the 3.9.2.1 firmware

fixed the ipv6 issue turned out the draytek had given three ipv6 leases to the network card no amount of releasing and renewing would fix that. Also noticed the virgin network speed was well down. Rebooted the pc and now got the correct ip configuration.
May have to now go round the network rebooting devices sigh.
The draytek has displayed funny things in regards to ipv6 in the past where old dns servers kept on re-appearing and new ones wouldn't appear which sorted itself out overnight. No idea where the information was stored.